/ Dictionary / Index L last quarter: Meaning and Definition of Find definitions for: last' quar'ter Pronunciation: [key] — Astron. Astron. the instant, approximately one week after a full moon, when half of the moon's disk is illuminated by the sun. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. last post last rites Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language