A '''routine''' is a modular unit of a [program].  In Tcl, a routine is the
thing that is executed in the process of [eval%|%evaluting] one [command].  .
The [Dodekalogue%|%official documentation] currently uses the term "[command
procedure]" in place of the term "routine".  In order to evaluate a command,
Tcl uses the first [word] of a command to find and execute the associated
routine.  Many [Tcl Commands%|%built-in commands] are implemented as [C]
functions.  In the case of a [proc%|%procedure], the primary function of the
routine is to evaluate the body of the procedure.

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