[n] the act of forming something; "the constitution of a PTA group last year"; "it was the establishment of his reputation,"; "he still remembers the organization of the club"
[n] the fabrication of something in a particular shape
[n] creation by mental activity; "the formation of sentences"; "the formation of memories"
[n] a particular spatial arrangement
[n] an arrangement of people or things acting as a unit; "a defensive formation"; "a formation of planes"
[n] the geological features of the earth
[n] natural process that causes something to form; "the formation of gas in the intestine"; "the formation of crystals"; "the formation of pseudopods"