Breadcrumb Home > Dictionary > Index E easterly wave: Meaning and Definition of Find definitions for: east'erly wave' Pronunciation: [key] a westward-moving, wavelike disturbance of low atmospheric pressure embedded in tropical easterly winds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. easterly Easter Monday ✖ Related Content Daily Word Quiz: hortatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language