For*ma"tion (?), n. [L. formatio: cf. F. formation.]


The act of giving form or shape to anything; a forming; a shaping.



The manner in which a thing is formed; structure; construction; conformation; form; as, the peculiar formation of the heart.


A substance formed or deposited.

4. Geol. (a)

Mineral deposits and rock masses designated with reference to their origin; as, the siliceous formation about geysers; alluvial formations; marine formations.


A group of beds of the same age or period; as, the Eocene formation.

5. Mil.

The arrangement of a body of troops, as in a square, column, etc.



© Webster 1913.

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