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English definition of “formation”

formation

noun [C/U] (COMING TOGETHER) /fɔrˈmeɪ·ʃən/
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 noun (COMING TOGETHER) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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