/ Dictionary / Index W Willamette: Meaning and Definition of Find definitions for: Wil•lam•ette Pronunciation: (wi-lam'it), [key] — n. a river flowing N through NW Oregon into the Columbia River at Portland. ab. 290 mi. (465 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: willamette (Thesaurus) Willaert Willard Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language