definition of
formation

[1] #1 formation n. an arrangement of people or things acting as a unit; "a defensive formation"; "a formation of planes". wn

[2] #2 formation n. [shaping] the act of fabricating something in a particular shape. wn

[3] #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] #4 formation n. [geological formation] (geology) the geological features of the earth. wn

[5] #5 formation n. a particular spatial arrangement. wn