/ Dictionary / Index I infinitive clause: Meaning and Definition of Find definitions for: infin'itive clause' Pronunciation: [key] — Gram. Gram. a clause containing an infinitive as its main or only verb form, as to speak clearly in Try to speak clearly. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. infinitive infinitize Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language