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WordReference Random House Learner's Dictionary of American English © 2024col•li•sion /kəˈlɪʒən/USA pronunciation n. - [uncountable] the act of colliding:to reduce the chance of collision.
an example or instance of this:[countable]a midair collision. WordReference Random House Unabridged Dictionary of American English © 2024col•li•sion (kə lizh′ən),USA pronunciation n. - the act of colliding;
a coming violently into contact;
crash:the collision of two airplanes. - a clash;
conflict:a collision of purposes. - Physicsthe meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum.
- Late Latin collīsiōn- (stem of collīsiō), equivalent. to collīs(us) (past participle of collīdere to collide) + -iōn- -ion
- late Middle English 1400–50
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