diff --git a/executable_semantics/ast/BUILD b/executable_semantics/ast/BUILD
index ed85e312b78f..996196024d9a 100644
--- a/executable_semantics/ast/BUILD
+++ b/executable_semantics/ast/BUILD
@@ -14,17 +14,6 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "class_definition",
-    hdrs = ["class_definition.h"],
-    deps = [
-        ":member",
-        ":source_location",
-        "//common:ostream",
-        "@llvm-project//llvm:Support",
-    ],
-)
-
 cc_library(
     name = "declaration",
     srcs = ["declaration.cpp"],
@@ -32,7 +21,6 @@ cc_library(
         "declaration.h",
     ],
     deps = [
-        ":class_definition",
         ":member",
         ":pattern",
         ":source_location",
diff --git a/executable_semantics/ast/class_definition.h b/executable_semantics/ast/class_definition.h
deleted file mode 100644
index bc9a013357d3..000000000000
--- a/executable_semantics/ast/class_definition.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
-// Exceptions. See /LICENSE for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-
-#ifndef EXECUTABLE_SEMANTICS_AST_CLASS_DEFINITION_H_
-#define EXECUTABLE_SEMANTICS_AST_CLASS_DEFINITION_H_
-
-#include <string>
-#include <vector>
-
-#include "executable_semantics/ast/member.h"
-#include "executable_semantics/ast/source_location.h"
-#include "executable_semantics/ast/static_scope.h"
-
-namespace Carbon {
-
-class StaticScope;
-
-class ClassDefinition {
- public:
-  ClassDefinition(SourceLocation source_loc, std::string name,
-                  std::vector<Nonnull<Member*>> members)
-      : source_loc_(source_loc),
-        name_(std::move(name)),
-        members_(std::move(members)) {}
-
-  auto source_loc() const -> SourceLocation { return source_loc_; }
-  auto name() const -> const std::string& { return name_; }
-  auto members() const -> llvm::ArrayRef<Nonnull<Member*>> { return members_; }
-
-  // Contains class members.
-  auto static_scope() const -> const StaticScope& { return static_scope_; }
-  auto static_scope() -> StaticScope& { return static_scope_; }
-
- private:
-  SourceLocation source_loc_;
-  std::string name_;
-  std::vector<Nonnull<Member*>> members_;
-  StaticScope static_scope_;
-};
-
-}  // namespace Carbon
-
-#endif  // EXECUTABLE_SEMANTICS_AST_CLASS_DEFINITION_H_
diff --git a/executable_semantics/ast/declaration.cpp b/executable_semantics/ast/declaration.cpp
index 46d75d7349a6..2960796e1500 100644
--- a/executable_semantics/ast/declaration.cpp
+++ b/executable_semantics/ast/declaration.cpp
@@ -17,10 +17,9 @@ void Declaration::Print(llvm::raw_ostream& out) const {
       break;
 
     case Kind::ClassDeclaration: {
-      const ClassDefinition& class_def =
-          cast<ClassDeclaration>(*this).definition();
-      out << "class " << class_def.name() << " {\n";
-      for (Nonnull<Member*> m : class_def.members()) {
+      const auto& class_decl = cast<ClassDeclaration>(*this);
+      out << "class " << class_decl.name() << " {\n";
+      for (Nonnull<Member*> m : class_decl.members()) {
         out << *m;
       }
       out << "}\n";
diff --git a/executable_semantics/ast/declaration.h b/executable_semantics/ast/declaration.h
index 0a623e98b167..ae3fcb48bf42 100644
--- a/executable_semantics/ast/declaration.h
+++ b/executable_semantics/ast/declaration.h
@@ -10,7 +10,6 @@
 #include <vector>
 
 #include "common/ostream.h"
-#include "executable_semantics/ast/class_definition.h"
 #include "executable_semantics/ast/member.h"
 #include "executable_semantics/ast/pattern.h"
 #include "executable_semantics/ast/source_location.h"
@@ -160,17 +159,24 @@ class ClassDeclaration : public Declaration {
   ClassDeclaration(SourceLocation source_loc, std::string name,
                    std::vector<Nonnull<Member*>> members)
       : Declaration(Kind::ClassDeclaration, source_loc),
-        definition_(source_loc, std::move(name), std::move(members)) {}
+        name_(std::move(name)),
+        members_(std::move(members)) {}
 
   static auto classof(const Declaration* decl) -> bool {
     return decl->kind() == Kind::ClassDeclaration;
   }
 
-  auto definition() const -> const ClassDefinition& { return definition_; }
-  auto definition() -> ClassDefinition& { return definition_; }
+  auto name() const -> const std::string& { return name_; }
+  auto members() const -> llvm::ArrayRef<Nonnull<Member*>> { return members_; }
+
+  // Contains class members. Scoped variables are in the body.
+  auto static_scope() const -> const StaticScope& { return static_scope_; }
+  auto static_scope() -> StaticScope& { return static_scope_; }
 
  private:
-  ClassDefinition definition_;
+  std::string name_;
+  std::vector<Nonnull<Member*>> members_;
+  StaticScope static_scope_;
 };
 
 class ChoiceDeclaration : public Declaration {
diff --git a/executable_semantics/interpreter/interpreter.cpp b/executable_semantics/interpreter/interpreter.cpp
index 981a64d34885..249331028ef8 100644
--- a/executable_semantics/interpreter/interpreter.cpp
+++ b/executable_semantics/interpreter/interpreter.cpp
@@ -127,10 +127,10 @@ void Interpreter::InitEnv(const Declaration& d, Env* env) {
     }
 
     case Declaration::Kind::ClassDeclaration: {
-      const ClassDefinition& class_def = cast<ClassDeclaration>(d).definition();
+      const auto& class_decl = cast<ClassDeclaration>(d);
       std::vector<NamedValue> fields;
       std::vector<NamedValue> methods;
-      for (Nonnull<const Member*> m : class_def.members()) {
+      for (Nonnull<const Member*> m : class_decl.members()) {
         switch (m->kind()) {
           case Member::Kind::FieldMember: {
             const BindingPattern& binding = cast<FieldMember>(*m).binding();
@@ -143,9 +143,9 @@ void Interpreter::InitEnv(const Declaration& d, Env* env) {
         }
       }
       auto st = arena_->New<NominalClassType>(
-          class_def.name(), std::move(fields), std::move(methods));
+          class_decl.name(), std::move(fields), std::move(methods));
       AllocationId a = heap_.AllocateValue(st);
-      env->Set(class_def.name(), a);
+      env->Set(class_decl.name(), a);
       break;
     }
 
diff --git a/executable_semantics/interpreter/resolve_names.cpp b/executable_semantics/interpreter/resolve_names.cpp
index f5c59b69f11c..b847447fc749 100644
--- a/executable_semantics/interpreter/resolve_names.cpp
+++ b/executable_semantics/interpreter/resolve_names.cpp
@@ -141,10 +141,10 @@ void PopulateNamesInDeclaration(Arena* arena, Declaration& declaration,
       break;
     }
     case Declaration::Kind::ClassDeclaration: {
-      auto& class_def = cast<ClassDeclaration>(declaration).definition();
-      static_scope.Add(class_def.name(), &declaration);
-      for (auto* member : class_def.members()) {
-        PopulateNamesInMember(arena, *member, class_def.static_scope());
+      auto& class_decl = cast<ClassDeclaration>(declaration);
+      static_scope.Add(class_decl.name(), &declaration);
+      for (auto* member : class_decl.members()) {
+        PopulateNamesInMember(arena, *member, class_decl.static_scope());
       }
       break;
     }
diff --git a/executable_semantics/interpreter/type_checker.cpp b/executable_semantics/interpreter/type_checker.cpp
index 7e70c36ce26a..135a99cf38b3 100644
--- a/executable_semantics/interpreter/type_checker.cpp
+++ b/executable_semantics/interpreter/type_checker.cpp
@@ -1088,11 +1088,12 @@ auto TypeChecker::TypeOfFunDef(TypeEnv types, Env values,
                                    ret);
 }
 
-auto TypeChecker::TypeOfClassDef(const ClassDefinition* sd, TypeEnv /*types*/,
-                                 Env ct_top) -> Nonnull<const Value*> {
+auto TypeChecker::TypeOfClassDecl(const ClassDeclaration& class_decl,
+                                  TypeEnv /*types*/, Env ct_top)
+    -> Nonnull<const Value*> {
   std::vector<NamedValue> fields;
   std::vector<NamedValue> methods;
-  for (Nonnull<const Member*> m : sd->members()) {
+  for (Nonnull<const Member*> m : class_decl.members()) {
     switch (m->kind()) {
       case Member::Kind::FieldMember: {
         const BindingPattern& binding = cast<FieldMember>(*m).binding();
@@ -1111,7 +1112,7 @@ auto TypeChecker::TypeOfClassDef(const ClassDefinition* sd, TypeEnv /*types*/,
       }
     }
   }
-  return arena_->New<NominalClassType>(sd->name(), std::move(fields),
+  return arena_->New<NominalClassType>(class_decl.name(), std::move(fields),
                                        std::move(methods));
 }
 
@@ -1120,7 +1121,7 @@ static auto GetName(const Declaration& d) -> const std::string& {
     case Declaration::Kind::FunctionDeclaration:
       return cast<FunctionDeclaration>(d).name();
     case Declaration::Kind::ClassDeclaration:
-      return cast<ClassDeclaration>(d).definition().name();
+      return cast<ClassDeclaration>(d).name();
     case Declaration::Kind::ChoiceDeclaration:
       return cast<ChoiceDeclaration>(d).name();
     case Declaration::Kind::VariableDeclaration: {
@@ -1192,11 +1193,11 @@ void TypeChecker::TopLevel(Nonnull<Declaration*> d, TypeCheckContext* tops) {
     }
 
     case Declaration::Kind::ClassDeclaration: {
-      const auto& class_def = cast<ClassDeclaration>(*d).definition();
-      auto st = TypeOfClassDef(&class_def, tops->types, tops->values);
+      const auto& class_decl = cast<ClassDeclaration>(*d);
+      auto st = TypeOfClassDecl(class_decl, tops->types, tops->values);
       AllocationId a = interpreter_.AllocateValue(st);
-      tops->values.Set(class_def.name(), a);  // Is this obsolete?
-      tops->types.Set(class_def.name(), st);
+      tops->values.Set(class_decl.name(), a);  // Is this obsolete?
+      tops->types.Set(class_decl.name(), st);
       break;
     }
 
diff --git a/executable_semantics/interpreter/type_checker.h b/executable_semantics/interpreter/type_checker.h
index 467c430f66f2..7874b77f806f 100644
--- a/executable_semantics/interpreter/type_checker.h
+++ b/executable_semantics/interpreter/type_checker.h
@@ -132,8 +132,8 @@ class TypeChecker {
 
   auto TypeOfFunDef(TypeEnv types, Env values, FunctionDeclaration* fun_def)
       -> Nonnull<const Value*>;
-  auto TypeOfClassDef(const ClassDefinition* sd, TypeEnv /*types*/, Env ct_top)
-      -> Nonnull<const Value*>;
+  auto TypeOfClassDecl(const ClassDeclaration& class_decl, TypeEnv /*types*/,
+                       Env ct_top) -> Nonnull<const Value*>;
 
   auto TopLevel(std::vector<Nonnull<Declaration*>>* fs) -> TypeCheckContext;
   void TopLevel(Nonnull<Declaration*> d, TypeCheckContext* tops);