formation

(noun) an arrangement of people or things acting as a unit. Examples: "A defensive formation." "A formation of planes."

(noun) the act of fabricating something in a particular shape. Synonyms: shaping.

(noun) the act of forming or establishing something. Synonyms: constitution, establishment, organization, organisation. Examples: "The constitution of a pta group last year." "It was the establishment of his reputation." "He still remembers the organization of the club."

(noun) (geology) the geological features of the earth. Synonyms: geological formation.

(noun) a particular spatial arrangement.

(noun) natural process that causes something to form. Examples: "The formation of gas in the intestine." "The formation of crystals." "The formation of pseudopods."

(noun) creation by mental activity. Examples: "The formation of sentences." "The formation of memories."