/ Dictionary / Index F firstborn: Meaning and Definition of Find definitions for: first•born Pronunciation: (fûrst'bôrn'), [key] — adj. first in the order of birth; eldest. —n. a firstborn child. a first result or product. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: firstborn (Thesaurus) first baseman First Cause Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language