diff --git a/src/language/__tests__/schema-parser-test.js b/src/language/__tests__/schema-parser-test.js
index 96beac4114..029b3411d2 100644
--- a/src/language/__tests__/schema-parser-test.js
+++ b/src/language/__tests__/schema-parser-test.js
@@ -823,7 +823,7 @@ input Hello {
             },
           },
           arguments: [],
-          repeatable: false,
+          isRepeatable: false,
           locations: [
             {
               kind: 'Name',
@@ -874,7 +874,7 @@ input Hello {
             },
           },
           arguments: [],
-          repeatable: true,
+          isRepeatable: true,
           locations: [
             {
               kind: 'Name',
diff --git a/src/language/ast.js b/src/language/ast.js
index 8dee33c8a3..4b9906bb9a 100644
--- a/src/language/ast.js
+++ b/src/language/ast.js
@@ -508,7 +508,7 @@ export type DirectiveDefinitionNode = {
   +description?: StringValueNode,
   +name: NameNode,
   +arguments?: $ReadOnlyArray<InputValueDefinitionNode>,
-  +repeatable: boolean,
+  +isRepeatable: boolean,
   +locations: $ReadOnlyArray<NameNode>,
 };
 
diff --git a/src/language/parser.js b/src/language/parser.js
index ddc728b941..7b6d621bf4 100644
--- a/src/language/parser.js
+++ b/src/language/parser.js
@@ -1395,7 +1395,7 @@ function parseDirectiveDefinition(lexer: Lexer<*>): DirectiveDefinitionNode {
     description,
     name,
     arguments: args,
-    repeatable,
+    isRepeatable: repeatable,
     locations,
     loc: loc(lexer, start),
   };
diff --git a/src/language/printer.js b/src/language/printer.js
index f9d7cadd26..e72a9d67f7 100644
--- a/src/language/printer.js
+++ b/src/language/printer.js
@@ -181,13 +181,13 @@ const printDocASTReducer = {
   ),
 
   DirectiveDefinition: addDescription(
-    ({ name, arguments: args, locations, repeatable }) =>
+    ({ name, arguments: args, locations, isRepeatable }) =>
       'directive @' +
       name +
       (args.every(arg => arg.indexOf('\n') === -1)
         ? wrap('(', join(args, ', '), ')')
         : wrap('(\n', indent(join(args, '\n')), '\n)')) +
-      (repeatable ? ' repeatable' : '') +
+      (isRepeatable ? ' repeatable' : '') +
       ' on ' +
       join(locations, ' | '),
   ),
diff --git a/src/type/__tests__/introspection-test.js b/src/type/__tests__/introspection-test.js
index 41e0c81417..2dc82784f4 100644
--- a/src/type/__tests__/introspection-test.js
+++ b/src/type/__tests__/introspection-test.js
@@ -704,7 +704,7 @@ describe('Introspection', () => {
                   args: [],
                   deprecationReason: null,
                   isDeprecated: false,
-                  name: 'repeatable',
+                  name: 'isRepeatable',
                   type: {
                     kind: 'NON_NULL',
                     name: null,
@@ -921,7 +921,7 @@ describe('Introspection', () => {
             defaultValue: null,
           },
         ],
-        repeatable: false,
+        isRepeatable: false,
       },
       {
         name: 'skip',
@@ -941,7 +941,7 @@ describe('Introspection', () => {
             defaultValue: null,
           },
         ],
-        repeatable: false,
+        isRepeatable: false,
       },
       {
         name: 'deprecated',
@@ -957,7 +957,7 @@ describe('Introspection', () => {
             defaultValue: '"No longer supported"',
           },
         ],
-        repeatable: false,
+        isRepeatable: false,
       },
     ]);
   });
diff --git a/src/type/directives.js b/src/type/directives.js
index f24603fda3..4c9c5d68fd 100644
--- a/src/type/directives.js
+++ b/src/type/directives.js
@@ -44,14 +44,15 @@ export class GraphQLDirective {
   locations: Array<DirectiveLocationEnum>;
   args: Array<GraphQLArgument>;
   astNode: ?DirectiveDefinitionNode;
-  repeatable: boolean;
+  isRepeatable: boolean;
 
   constructor(config: GraphQLDirectiveConfig): void {
     this.name = config.name;
     this.description = config.description;
     this.locations = config.locations;
     this.astNode = config.astNode;
-    this.repeatable = config.repeatable == null ? false : config.repeatable;
+    this.isRepeatable =
+      config.isRepeatable == null ? false : config.isRepeatable;
 
     invariant(config.name, 'Directive must be named.');
     invariant(
@@ -95,7 +96,7 @@ export type GraphQLDirectiveConfig = {|
   locations: Array<DirectiveLocationEnum>,
   args?: ?GraphQLFieldConfigArgumentMap,
   astNode?: ?DirectiveDefinitionNode,
-  repeatable?: ?boolean,
+  isRepeatable?: ?boolean,
 |};
 
 /**
diff --git a/src/type/introspection.js b/src/type/introspection.js
index f8cf49f075..8493470992 100644
--- a/src/type/introspection.js
+++ b/src/type/introspection.js
@@ -98,11 +98,11 @@ export const __Directive = new GraphQLObjectType({
       type: GraphQLNonNull(GraphQLList(GraphQLNonNull(__InputValue))),
       resolve: directive => directive.args || [],
     },
-    repeatable: {
+    isRepeatable: {
       type: GraphQLNonNull(GraphQLBoolean),
       description:
         'Permits using the directive multiple times at the same location.',
-      resolve: directive => directive.repeatable,
+      resolve: directive => directive.isRepeatable,
     },
   }),
 });
diff --git a/src/utilities/__tests__/buildASTSchema-test.js b/src/utilities/__tests__/buildASTSchema-test.js
index 7b5b43809f..3f526228d2 100644
--- a/src/utilities/__tests__/buildASTSchema-test.js
+++ b/src/utilities/__tests__/buildASTSchema-test.js
@@ -104,7 +104,7 @@ describe('Schema Builder', () => {
     expect(output).to.equal(body);
 
     const schema = buildASTSchema(parse(body));
-    expect(schema.getDirective('foo').repeatable).to.equal(true);
+    expect(schema.getDirective('foo').isRepeatable).to.equal(true);
   });
 
   it('Supports descriptions', () => {
diff --git a/src/utilities/__tests__/buildClientSchema-test.js b/src/utilities/__tests__/buildClientSchema-test.js
index 5429d5f8d7..91db2c8767 100644
--- a/src/utilities/__tests__/buildClientSchema-test.js
+++ b/src/utilities/__tests__/buildClientSchema-test.js
@@ -596,7 +596,7 @@ describe('Type System: build schema from introspection', () => {
         new GraphQLDirective({
           name: 'customRepeatableDirective',
           description: 'This is a custom repeatable directive',
-          repeatable: true,
+          isRepeatable: true,
           locations: ['FIELD'],
         }),
       ],
diff --git a/src/utilities/__tests__/extendSchema-test.js b/src/utilities/__tests__/extendSchema-test.js
index eb13748b7a..97b9021467 100644
--- a/src/utilities/__tests__/extendSchema-test.js
+++ b/src/utilities/__tests__/extendSchema-test.js
@@ -120,7 +120,7 @@ const RepeatableDirective = new GraphQLDirective({
   args: {
     input: { type: SomeInputType },
   },
-  repeatable: true,
+  isRepeatable: true,
   locations: [DirectiveLocation.OBJECT, DirectiveLocation.INTERFACE],
 });
 
diff --git a/src/utilities/__tests__/schemaPrinter-test.js b/src/utilities/__tests__/schemaPrinter-test.js
index 08fc91f940..419f990972 100644
--- a/src/utilities/__tests__/schemaPrinter-test.js
+++ b/src/utilities/__tests__/schemaPrinter-test.js
@@ -652,7 +652,7 @@ describe('Type System Printer', () => {
         args: [__InputValue!]!
 
         """Permits using the directive multiple times at the same location."""
-        repeatable: Boolean!
+        isRepeatable: Boolean!
       }
 
       """
@@ -888,7 +888,7 @@ describe('Type System Printer', () => {
         args: [__InputValue!]!
 
         # Permits using the directive multiple times at the same location.
-        repeatable: Boolean!
+        isRepeatable: Boolean!
       }
 
       # A Directive can be adjacent to many parts of the GraphQL language, a
diff --git a/src/utilities/buildASTSchema.js b/src/utilities/buildASTSchema.js
index 3354198db6..f3dfcc57fb 100644
--- a/src/utilities/buildASTSchema.js
+++ b/src/utilities/buildASTSchema.js
@@ -282,7 +282,7 @@ export class ASTDefinitionBuilder {
       args:
         directiveNode.arguments &&
         this._makeInputValues(directiveNode.arguments),
-      repeatable: directiveNode.repeatable,
+      isRepeatable: directiveNode.isRepeatable,
       astNode: directiveNode,
     });
   }
diff --git a/src/utilities/buildClientSchema.js b/src/utilities/buildClientSchema.js
index d1da2eb013..3f267a185f 100644
--- a/src/utilities/buildClientSchema.js
+++ b/src/utilities/buildClientSchema.js
@@ -355,10 +355,10 @@ export function buildClientSchema(
       description: directiveIntrospection.description,
       locations: directiveIntrospection.locations.slice(),
       args: buildInputValueDefMap(directiveIntrospection.args),
-      repeatable:
-        directiveIntrospection.repeatable === undefined
+      isRepeatable:
+        directiveIntrospection.isRepeatable === undefined
           ? false
-          : directiveIntrospection.repeatable,
+          : directiveIntrospection.isRepeatable,
     });
   }
 
diff --git a/src/utilities/extendSchema.js b/src/utilities/extendSchema.js
index 21ce29973c..ca6338332b 100644
--- a/src/utilities/extendSchema.js
+++ b/src/utilities/extendSchema.js
@@ -320,7 +320,7 @@ export function extendSchema(
       locations: directive.locations,
       args: extendArgs(directive.args),
       astNode: directive.astNode,
-      repeatable: directive.repeatable,
+      isRepeatable: directive.isRepeatable,
     });
   }
 
diff --git a/src/utilities/findBreakingChanges.js b/src/utilities/findBreakingChanges.js
index 6a77981a4b..36669cd224 100644
--- a/src/utilities/findBreakingChanges.js
+++ b/src/utilities/findBreakingChanges.js
@@ -856,7 +856,7 @@ export function findRemovedDirectiveRepeatable(
       continue;
     }
 
-    if (oldDirective.repeatable && !newDirective.repeatable) {
+    if (oldDirective.isRepeatable && !newDirective.isRepeatable) {
       removedRepeatable.push({
         type: BreakingChangeType.DIRECTIVE_REPEATABLE_REMOVED,
         description: `Repeatable flag was removed from ${newDirective.name}`,
diff --git a/src/utilities/introspectionQuery.js b/src/utilities/introspectionQuery.js
index 330f241947..f3ed594d1a 100644
--- a/src/utilities/introspectionQuery.js
+++ b/src/utilities/introspectionQuery.js
@@ -13,7 +13,7 @@ export type IntrospectionOptions = {|
   // Whether to include descriptions in the introspection result.
   // Default: true
   descriptions: boolean,
-  // Whether to include `repeatable` flag on directives.
+  // Whether to include `isRepeatable` flag on directives.
   // Default: false
   directiveRepeatableFlag?: ?boolean,
 |};
@@ -38,7 +38,7 @@ export function getIntrospectionQuery(options?: IntrospectionOptions): string {
           args {
             ...InputValue
           }
-          ${directiveRepeatableFlag ? 'repeatable' : ''}
+          ${directiveRepeatableFlag ? 'isRepeatable' : ''}
         }
       }
     }
@@ -279,5 +279,5 @@ export type IntrospectionDirective = {|
   +description?: ?string,
   +locations: $ReadOnlyArray<DirectiveLocationEnum>,
   +args: $ReadOnlyArray<IntrospectionInputValue>,
-  +repeatable?: boolean,
+  +isRepeatable?: boolean,
 |};
diff --git a/src/utilities/schemaPrinter.js b/src/utilities/schemaPrinter.js
index f6572a7283..15ee31fe65 100644
--- a/src/utilities/schemaPrinter.js
+++ b/src/utilities/schemaPrinter.js
@@ -309,7 +309,7 @@ function printDirective(directive, options) {
     'directive @' +
     directive.name +
     printArgs(options, directive.args) +
-    (directive.repeatable ? ' repeatable' : '') +
+    (directive.isRepeatable ? ' repeatable' : '') +
     ' on ' +
     directive.locations.join(' | ')
   );
diff --git a/src/validation/__tests__/harness.js b/src/validation/__tests__/harness.js
index 2b4c4a6f14..c5ce1b5221 100644
--- a/src/validation/__tests__/harness.js
+++ b/src/validation/__tests__/harness.js
@@ -396,7 +396,7 @@ export const testSchema = new GraphQLSchema({
           description: 'Some generic ID.',
         },
       },
-      repeatable: true,
+      isRepeatable: true,
       locations: ['OBJECT'],
     }),
   ],
diff --git a/src/validation/rules/UniqueDirectivesPerLocation.js b/src/validation/rules/UniqueDirectivesPerLocation.js
index fb2782bc7a..a4eef87bc6 100644
--- a/src/validation/rules/UniqueDirectivesPerLocation.js
+++ b/src/validation/rules/UniqueDirectivesPerLocation.js
@@ -40,13 +40,13 @@ export function UniqueDirectivesPerLocation(
     ? schema.getDirectives()
     : specifiedDirectives;
   for (const directive of definedDirectives) {
-    uniqueDirectiveMap[directive.name] = !directive.repeatable;
+    uniqueDirectiveMap[directive.name] = !directive.isRepeatable;
   }
 
   const astDefinitions = context.getDocument().definitions;
   for (const def of astDefinitions) {
     if (def.kind === Kind.DIRECTIVE_DEFINITION) {
-      uniqueDirectiveMap[def.name.value] = !def.repeatable;
+      uniqueDirectiveMap[def.name.value] = !def.isRepeatable;
     }
   }