formation in WordNet English dictionary

1. 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"
   constitution  establishment  formation  organization  organisation 
   
2. the act of fabricating something in a particular shape
   formation  shaping 
   
3. creation by mental activity
   "the formation of sentences"; "the formation of memories"
   formation 
   
4. a particular spatial arrangement
   formation 
   
5. an arrangement of people or things acting as a unit
   "a defensive formation"; "a formation of planes"
   formation 
   
6. (geology) the geological features of the earth
   geological formation  formation 
   
7. natural process that causes something to form
   "the formation of gas in the intestine"; "the formation of crystals"; "the formation of pseudopods"
   formation