• The act of assembling a group or structure.
  • Something possessing structure or form.
  • The process during which something comes into being and gains its characteristics.
  • A grouping of military units or smaller formations under a command, such as a brigade, division, wing, etc.
  • A layer of rock of common origin.
  • An arrangement of moving troops, ships, or aircraft, such as a wedge, line abreast, or echelon. Often "in formation".
  • An arrangement of players designed to facilitate certain plays.
  • The process of influencing or guiding a person to a deeper understanding of a particular vocation.
  • A structure made of two categories, two functors from the first to the second category, and a transformation from one of the functors to the other.


  • From Middle English formacioun, formation, borrowed from Old French formacion, from Latin fōrmātiō, from fōrmō; see form as verb.
  • Morphologically form + -ation

Modern English dictionary

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