/ Dictionary / Index S semiyearly: Meaning and Definition of Find definitions for: sem•i•year•ly Pronunciation: (sem"ē-yēr'lē, sem"ī-), [key] — adj. semiannual (def. 1). —adv. twice a year; semiannually: He seeded the lawn semiyearly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. semiweekly Semmelweis 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