noun

• The act of assembling a group or structure. [from Template:SAFESUBST: c.]
• Something possessing structure or form. [from Template:SAFESUBST: c.]
• The process during which something comes into being and gains its characteristics. [from Template:SAFESUBST: c.]
• (military) A grouping of military units or smaller formations under a command, such as a brigade, division, wing, etc. [from Template:SAFESUBST: c.]
• (geology) A layer of rock of common origin. [from Template:SAFESUBST: c.]
• (military) An arrangement of moving troops, ships, or aircraft, such as a wedge, line abreast, or echelon. Often "in formation".
• (sports) 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.
• (category theory) 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.