diff --git a/src/commands/CMakeLists.txt b/src/commands/CMakeLists.txt
index 87363c10..89276d10 100644
--- a/src/commands/CMakeLists.txt
+++ b/src/commands/CMakeLists.txt
@@ -9,7 +9,6 @@ set (commands_SRCS CmdClear.cpp
                    CmdConfig.cpp
                    CmdContinue.cpp
                    CmdDefault.cpp
-                   CmdDefine.cpp
                    CmdDiagnostics.cpp
                    CmdExport.cpp
                    CmdExtensions.cpp
diff --git a/src/commands/CmdDefine.cpp b/src/commands/CmdDefine.cpp
deleted file mode 100644
index db8bb5de..00000000
--- a/src/commands/CmdDefine.cpp
+++ /dev/null
@@ -1,82 +0,0 @@
-////////////////////////////////////////////////////////////////////////////////
-//
-// Copyright 2015 - 2016, Paul Beckingham, Federico Hernandez.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
-//
-// http://www.opensource.org/licenses/mit-license.php
-//
-////////////////////////////////////////////////////////////////////////////////
-
-#include <cmake.h>
-#include <commands.h>
-#include <shared.h>
-#include <format.h>
-#include <iostream>
-
-////////////////////////////////////////////////////////////////////////////////
-// timew define holidays <locale>|none
-// timew define holidays [work] <date>
-// timew define week <day>[- <day>] [, <day>] ...
-// timew define day [<day>] start|end <time>
-//
-// timew define tag <tag> description <string>
-// timew define tag <tag> start|end <date>
-// timew define tag <tag> budget <number> <units> per <unit>
-// timew define tag <tag> budget <number> <units> total
-// timew define tag <tag> overlap
-// timew define tag <tag> color <color>
-//
-int CmdDefine (
-  CLI& cli,
-  Rules& rules,
-  Database& database)
-{
-  auto words = cli.getWords ();
-  if (words.size () >= 1)
-  {
-    std::vector <std::string> subcommands = {"holidays", "week", "day", "tag"};
-    std::vector <std::string> matches;
-    autoComplete (words[0], subcommands, matches);
-
-    if (matches.size () != 1)
-      throw format ("Unrecognized definition '{1}'.", words[0]);
-
-    if (matches[0] == "holidays")
-    {
-      std::cout << "# define holidays ...\n";
-    }
-    else if (matches[0] == "week")
-    {
-      std::cout << "# define week ...\n";
-    }
-    else if (matches[0] == "day")
-    {
-      std::cout << "# define day ...\n";
-    }
-    else if (matches[0] == "tag")
-    {
-      std::cout << "# define tag ...\n";
-    }
-  }
-
-  return 0;
-}
-
-////////////////////////////////////////////////////////////////////////////////
diff --git a/src/commands/CmdHelp.cpp b/src/commands/CmdHelp.cpp
index 4e136b0c..b89e7b93 100644
--- a/src/commands/CmdHelp.cpp
+++ b/src/commands/CmdHelp.cpp
@@ -45,7 +45,6 @@ int CmdHelpUsage ()
 
   // TODO clear
   // TODO config
-  // TODO define
   // TODO gaps
   // TODO help
   // TODO import
@@ -93,7 +92,6 @@ int CmdHelp (CLI& cli)
                 << "\n"
                 << "See also 'start', 'stop'.\n"
                 << "\n";
-    // TODO define
 
     // Ruler                 1         2         3         4         5         6         7         8
     //              12345678901234567890123456789012345678901234567890123456789012345678901234567890
diff --git a/src/commands/commands.h b/src/commands/commands.h
index ae0452af..4d0fb3dd 100644
--- a/src/commands/commands.h
+++ b/src/commands/commands.h
@@ -36,7 +36,6 @@ int CmdClear       (                                    );
 int CmdConfig      (                                    );
 int CmdContinue    (      Rules&, Database&             );
 int CmdDefault     (      Rules&, Database&             );
-int CmdDefine      (CLI&, Rules&, Database&             );
 int CmdDiagnostics (      Rules&, Database&, Extensions&);
 int CmdExport      (CLI&, Rules&, Database&             );
 int CmdExtensions  (      Rules&,            Extensions&);
diff --git a/src/init.cpp b/src/init.cpp
index c21de306..0bd063c7 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -190,7 +190,6 @@ int dispatchCommand (
          if (command == "clear")       status = CmdClear       (                                );
     else if (command == "config")      status = CmdConfig      (                                );
     else if (command == "continue")    status = CmdContinue    (     rules, database            );
-    else if (command == "define")      status = CmdDefine      (cli, rules, database            );
     else if (command == "diagnostics") status = CmdDiagnostics (     rules, database, extensions);
     else if (command == "export")      status = CmdExport      (cli, rules, database            );
     else if (command == "extensions")  status = CmdExtensions  (     rules,           extensions);