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Formation (n.) The act of giving form or shape to anything; a forming; a shaping.
Formation (n.) The manner in which a thing is formed; structure; construction; conformation; form; as, the peculiar formation of the heart.
Formation (n.) A substance formed or deposited.
Formation (n.) Mineral deposits and rock masses designated with reference to their origin; as, the siliceous formation about geysers; alluvial formations; marine formations.
Formation (n.) A group of beds of the same age or period; as, the Eocene formation.
Formation (n.) The arrangement of a body of troops, as in a square, column, etc.