Breadcrumb Home > Dictionary > Index R reaction engine: Meaning and Definition of Find definitions for: reac'tion en"gine Pronunciation: [key] — Aeron., Rocketry. Aeron.,Rocketry. an engine that produces power as a reaction to the momentum given to gases ejected from it, as a rocket or jet engine. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. reactionary reaction formation TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: samizdat Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language