DEFER ( "<spaces>name" -- ) CORE-EXT X:deferred
Skip leading space delimiters. Parse name delimited by a space. Create a definition for name with the execution semantics defined below.
name Execution: ( i*x -- j*x )
Execute xt associated with name. An ambiguous condition exists if name has not been associated with an xt yet.

IS CORE-EXT X:deferred
Interpretation: ( xt "<spaces>name" -- )
Skip leading spaces and parse name delimited by a space. Set name to execute xt. An ambiguous condition exists if name was not defined by DEFER.
Compilation: ( "<spaces>name" -- )
Skip leading spaces and parse name delimited by a space. Append the run-time semantics given below to the current definition. An ambiguous condition exists if name was not defined by DEFER.
Run-time: ( xt -- )
Set name to execute xt.
An ambiguous condition exists if POSTPONE, [COMPILE], ['] or ' is applied to IS.
DEFER@ ( xt1 -- xt2 ) CORE-EXT X:deferred
xt2 is the xt associated with the deferred word corresponding to xt1. An ambiguous condition exists if xt1 is not for a word defined via DEFER, or if the deferred word has not been associated with an xt yet.
DEFER! ( xt2 xt1 -- ) CORE-EXT X:deferred
Set the word xt1 to execute xt2. An ambiguous condition exists if xt1 is not for a word defined via DEFER.

ACTION-OF CORE-EXT X:deferred
Interpretation: ( "<spaces>name" -- xt )
Skip leading spaces and parse name delimited by a space. xt is the xt associated with name. An ambiguous condition exists if name was not defined by DEFER, or if the name has not been associated with an xt yet.
Compilation: ( "<spaces>name" -- )
Skip leading spaces and parse name delimited by a space. Append the run-time semantics given below to the current definition. An ambiguous condition exists if name was not defined by DEFER.
Run-time: ( -- xt )
xt is the execution token associated with name when the run-time semantics is performed. An ambiguous condition exists if name has not been associated with an xt yet.
An ambiguous condition exists if POSTPONE, [COMPILE], ['] or ' is applied to ACTION-OF.