Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine
FORMATION
1. The act of giving form or shape to anything; a forming; a shaping.
2. The manner in which a thing is formed; structure; construction; conformation; form; as, the peculiarformation of the heart.
3. A stuff formed or deposited.
4. Mineral deposits and rock masses designated with reference to their origin; as, the siliceousformation about geysers; alluvial formations; marine formations. A group of beds of the sameage or period; as, the Eocene formation.
5. The arrangement of a body of troops, as in a square, column, etc.
Origin: L. Formatio: cf. F. Formation.
Source: Websters Vocabulary