/ Dictionary / Index H Hillingdon: Meaning and Definition of Find definitions for: Hil•ling•don Pronunciation: (hil'ing-dun), [key] — n. a borough of Greater London, England. 232,200. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hillerman Hillis Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language