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define command defines an identifier as a number. This is
useful to give a symbolic name to a constant used in more than one
character or fontdimen definition, for ease of change.
It has the form:
define id expr
The identifier id is defined to be the expression expr. Any
previous definition of id is replaced. The id can be used
prior to the
define command; Charspace doesn't try to resolve any
definitions in the CMI files until after all files have been read.