diff --git a/README.md b/README.md
index 8b4e292..34c54cb 100644
--- a/README.md
+++ b/README.md
@@ -85,4 +85,4 @@ $ ./planck < bootstrap.fs example/fib.fs
 | }    | shr       | ( a b -- c )    | c = a >> b (logical)         |
 | )    | sar       | ( a b -- c )    | c = a >> b (arithmetic)      |
 | v    | argv      | ( -- a-addr u ) | argv and argc                |
-| V    | impl      | ( -- c-addr )   | Implementation String        |
+| V    | version   | ( -- c-addr )   | Version String               |
diff --git a/bootstrap.fs b/bootstrap.fs
index b7ec23b..5ecaf86 100644
--- a/bootstrap.fs
+++ b/bootstrap.fs
@@ -458,7 +458,7 @@ alias-builtin and       &
 alias-builtin or        |
 alias-builtin xor       ^
 alias-builtin u<        u
-alias-builtin implementation V
+alias-builtin version   V
 
 \ Rename existing FORTH words
 : >cfa      G ;
@@ -2070,7 +2070,7 @@ v argc ! argv !
 
 ( === Environment-Dependent Code === )
 
-implementation s" hand-written i386-linux" streq [if]
+version s" hand-written i386-linux" streq [if]
 
 %000 constant eax immediate
 %001 constant ecx immediate
@@ -2401,7 +2401,7 @@ need-defined (read)
 
         words id. name>string name>link
         include included source >in
-        next-arg shift-args arg argv argc implementation
+        next-arg shift-args arg argv argc version
 
         [if] [unless] [else] [then] defined?
         open-file close-file write-file flush-file
@@ -2457,7 +2457,7 @@ need-defined (read)
         next-arg dup argv @ !
         included
     else
-        ." PlanckForth (implementation: " implementation type ." )" cr
+        ." PlanckForth (" version type ." )" cr
         ." Ready." cr
         s" /dev/tty" included
     then
diff --git a/others/planck.c b/others/planck.c
index 2beebc5..82c40e1 100644
--- a/others/planck.c
+++ b/others/planck.c
@@ -13,7 +13,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-#define IMPLEMENTATION "C"
+#define VERSION "C"
 
 typedef uintptr_t cell;
 typedef void (**cfa)();
@@ -143,7 +143,7 @@ defcode("t", type) { putchar(pop()); next(); }
 defcode("x", exec) { (*(ip = (cfa) pop()))(); }
 defcode("f", find_) { push((cell) find(pop())); next(); }
 defcode("v", argv_) { push((cell) saved_argv); push(saved_argc); next(); }
-defcode("V", impl) { push((cell) IMPLEMENTATION); next(); }
+defcode("V", impl) { push((cell) VERSION); next(); }
 defcode("/", divmod) {
     intptr_t b = pop();
     intptr_t a = pop();
diff --git a/others/planck.py b/others/planck.py
index c43092e..da28514 100644
--- a/others/planck.py
+++ b/others/planck.py
@@ -9,7 +9,7 @@ import operator
 import array
 import ctypes
 
-IMPLEMENTATION = "Python 3.x"
+VERSION = "Python 3.x"
 MEMORY_SIZE = 0x10000
 
 memory = array.array('i', [0]*MEMORY_SIZE)
@@ -169,8 +169,8 @@ for addr in argv_addrs:
     comma(addr)
 
 # Version String
-IMPLEMENTATION_ADDR = read(HERE_CELL)
-comma_string(IMPLEMENTATION)
+VERSION_ADDR = read(HERE_CELL)
+comma_string(VERSION)
 align()
 
 def docol(ip, np):
@@ -239,7 +239,7 @@ def argv():
     push(ARGV_ADDR)
     push(len(sys.argv))
 add_simple_operator('v', argv)
-add_simple_operator('V', lambda: push(IMPLEMENTATION_ADDR))
+add_simple_operator('V', lambda: push(VERSION_ADDR))
 
 SUCCESS = 0
 ALLOCATE_ERROR = -59
diff --git a/planck.xxd b/planck.xxd
index 58297f1..94c4b99 100644
--- a/planck.xxd
+++ b/planck.xxd
@@ -168,7 +168,7 @@
 000003b8: 0408 89c3 83c3 0453   movl %eax,%ebx; addl $4,%ebx; pushl %ebx
 000003c0: ff30 adff 2000 0000   pushl (%eax); next;
 
-000003c8: a883 0408 0156 0000   V: implementation
+000003c8: a883 0408 0156 0000   V: version
 000003d0: d483 0408 68dc 8304   pushl $version
 000003d8: 08ad ff20 6861 6e64   next; <version>hand
 000003e0: 2d77 7269 7474 656e   -written