1.an arrangement of people or things acting as a unit;
a defensive formation
2.a particular spatial arrangement
3.the fabrication of something in a particular shape
4.the act of forming something;
the constitution of a PTA group last year
5.(geology) the geological features of the earth
6.natural process that causes something to form;
the formation of gas in the intestine
7.creation by mental activity;
the formation of sentences