Etymology
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formation (n.)

late 14c., "vital force in plants and animals;" early 15c., "act of creating or making," from Old French formacion "formation, fashioning, creation" (12c.) or directly from Latin formationem (nominative formatio) "a forming, shaping," noun of action or condition from past-participle stem of formare "to form," from forma "form, shape" (see form (n.)). Meaning that which is formed or created" is from 1640s. In geology, "group of rocks having a similar origin or character," 1815. Related: Formational.

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Definitions of formation

formation (n.)
an arrangement of people or things acting as a unit;
a formation of planes
a defensive formation
formation (n.)
the act of fabricating something in a particular shape;
Synonyms: shaping
formation (n.)
the act of forming or establishing something;
formation (n.)
(geology) the geological features of the earth;
Synonyms: geological formation
formation (n.)
a particular spatial arrangement;
formation (n.)
natural process that causes something to form;
the formation of crystals
the formation of pseudopods
the formation of gas in the intestine
formation (n.)
creation by mental activity;
the formation of sentences
the formation of memories
From wordnet.princeton.edu