/ Dictionary / Index S secundus: Meaning and Definition of Find definitions for: se•cun•dus Pronunciation: (su-kun'dus), [key] — adj. (in prescriptions) second. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. secundine secure 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