/ Dictionary / Index P primary group: Meaning and Definition of Find definitions for: pri'mary group' Pronunciation: [key] — Sociol. Sociol. a group of individuals living in close, intimate, and personal relationship. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. primary gain primary industry Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language