What does collision mean?
A collision is a forceful encounter between two or more things that come together with impact. Most literally, it describes crashes — between cars, trains, aircraft, or other physical bodies — as in a head-on collision on a motorway. By extension, the word applies to conflicts that are not physical at all: a collision between rival political ambitions, competing business interests, or clashing cultural values suggests an abrupt and often damaging confrontation. In physics, collision has a precise technical meaning, describing interactions between particles or bodies in which energy and momentum are exchanged, whether elastically or inelastically. The word derives from Latin roots meaning 'to strike together', which captures its essential sense of things meeting with force. Because it works equally well for concrete accidents and abstract disagreements, collision is a versatile word in both everyday speech and formal writing, appearing constantly in news reporting, science, and commentary on human affairs.
nounAn instance of two or more objects or people crashing forcefully into one another; also, a conflict or clash between opposing ideas, interests, or people.
- A forceful impact between moving objects, vehicles, or bodies.
- A conflict or strong disagreement between people, ideas, interests, or cultures.
- (Physics) An interaction between particles or bodies in which they come into contact and exchange energy or momentum.
"The collision between the two trains left the line closed for hours."
"The driver swerved to avoid a head-on collision with the oncoming truck."
"The negotiation ended in a direct collision between the union's demands and the company's budget."
"In particle physics experiments, collisions between protons reveal the building blocks of matter."
Standard regular plural, used when referring to multiple impact events or repeated clashes.
"The intersection recorded more collisions last year than any other in the city."
The word 'collision' comes from the same Latin root as 'collide' — but its cousin 'collusion' took a very different path, ending up meaning secret plotting rather than a loud crash.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of collision
Collision comes from the Latin verb collidere, formed from com- ('together') and laedere ('to strike or injure'), so its literal root meaning is 'to strike together'. English adopted the noun in the early seventeenth century, initially in learned and scientific contexts before it spread into general use. It shares this Latin ancestry with collide itself and, more distantly through laedere, with words like collude and collusion, though those developed along a separate semantic path toward secret cooperation.
How collision is actually used
Collision is a neutral term used across registers, from everyday traffic reports to formal scientific writing. In physics contexts it carries technical senses (elastic vs. inelastic collision). The figurative sense — a clash of ideas or personalities — is common in journalism and political commentary.
Easily confused with collision
Collusion means secret cooperation for a deceitful purpose, whereas collision is a physical crash or an open clash.