formation - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “formation”

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formation

noun [C/U]  /fɔrˈmeɪ·ʃən/

formation noun [C/U] (ROCK)

earth science a large area of rock that has characteristics different from the land surrounding it

formation noun [C/U] (COMING TOGETHER)

the process by which something comes into existence or begins to have a particular order or shape: [U] They called for the formation of a committee to investigate corruption. A formation is the particular form that something has taken, or the things or people having this form: [C] unusual cloud formations [U] The soldiers marched in formation (= in an orderly arrangement).
(Definition of formation from the Cambridge Academic Content Dictionary © Cambridge University Press)
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