/ Dictionary / Index S semilogarithmic: Meaning and Definition of Find definitions for: sem•i•log•a•rith•mic Pronunciation: (sem"ē-lô"gu-ri'mik, -rith'-, -log"u-, sem"ī-), [key] — adj. Math. (of graphing) having one scale logarithmic and the other arithmetic or of uniform gradation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sémillon semilunar 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