/ Dictionary / Index S seise: Meaning and Definition of Find definitions for: seise Pronunciation: (sēz), [key] — seised, seis•ing. seize. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seirios seisin Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language