1. The SIze of something infinite. USIng the word in the context of sets is sloppy, SInce different infinite sets aren' t necessarily the same SIze cardinality as each other. See also aleph 0 2. The largest value that can be represented in a particular type of variable (register, memory location, data type, whatever). See also minus infinity. [Jargon File] (1994-11-18)