/ Dictionary / Index S subnet: Meaning and Definition of Find definitions for: sub•net Pronunciation: (sub'net"), [key] — n. Math. the abstraction, in topology, of a subsequence. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. submultiple subnitrate Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language