/ Dictionary / Index T trendline: Meaning and Definition of Find definitions for: trend•line Pronunciation: (trend'līn"), [key] — n. an upward or downward line on a chart indicating movements of average prices, as of stocks, over a period of time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trend trendsetter Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language