/ Dictionary / Index J John Hancock: Meaning and Definition of Find definitions for: John' Han'cock Pronunciation: [key] See a person's signature: Put your John Hancock onthis check. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. John F. Kennedy International Airport John Henry Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language