#1 formation n. an arrangement of people or things acting as a unit; "a defensive formation"; "a formation of planes". wn
#2 formation n. [shaping] the act of fabricating something in a particular shape. wn
#3 formation n. [constitution, establishment, organization, organisation] the act of forming or establishing something; "the constitution of a PTA group last year"; "it was the establishment of his reputation"; "he still remembers the organization of the club". wn
#4 formation n. [geological formation] (geology) the geological features of the earth. wn
#5 formation n. a particular spatial arrangement. wn
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