An instance of colliding. / (physics) Any event in which two or more bodies exert forces on each other in a relatively short time. In a collision, physical contact of two bodies is not necessary.

plural of collision

(obsolete) Colliding; clashing.

(chemistry) Any theory that relates collisions among particles to reaction rate; reaction rate depends on such factors as concentration, surface area, temperature, stirring, and the presence of either a catalyst or an inhibitor.

(transport) A collision where the front ends of two vehicles (such as ships, trains, cars, planes, etc.) hit each other, as opposed to a side-collision or rear-end collision.

plural of head-on collision

(physics) the interaction between two moving electric charges at close range

(nautical) A strong, watertight transverse bulkhead in the fore part of a ship to prevent water flowing aft in the event of a collision

(nautical) A large square of canvas, treated with a sealing agent and attached to lines at each corner; hauled over a damaged part of the hull to limit the inflow of water

plural of Coulomb collision