Englishfor English speakers
collision
Noun
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A collision occurs when two things collide.
assumption
Noun
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An assumption is a guess or belief about something without having enough information to know if it is true. In maths or science: something assumed to be true in order to build an argument or calculation.
You shouldn't make the assumption that guns are only a problem in big cities.
To calculate the age of a rock we make the assumption that the rate of radioactive decay is constant.