Definitions of formation

  1. the fabrication of something in a particular shape
  2. creation by mental activity; " the formation of sentences"; " the formation of memories"
  3. a particular spatial arrangement
  4. an arrangement of people or things acting as a unit; " a defensive formation"; " a formation of planes"
  5. the geological features of the earth
  6. ( geology) the geological features of the earth
  7. The act of giving form or shape to anything; a forming; a shaping.
  8. The manner in which a thing is formed; structure; construction; conformation; form; as, the peculiar formation of the heart.
  9. Mineral deposits and rock masses designated with reference to their origin; as, the siliceous formation about geysers; alluvial formations; marine formations.
  10. A group of beds of the same age or period; as, the Eocene formation.
  11. The arrangement of a body of troops, as in a square, column, etc.
  12. The act of molding or shaping; that which is shaped; structure; figure.
  13. The act of forming or making; the act of creating or causing to exist; the operation of composing, by bringing materials together, or of shaping and giving form; generation; production; as, the formation of the earth; the formation of a state or constitution; the formation of ideas: the manner in which a thing is formed; as, the peculiar formation of the heart: in geol. any series of rocks referred to a common origin or period, whether they consist of the same or different materials. Geological strata are divided into certain groups of one era of deposition, sometimes of very dissimilar mineralogical character, but inclosing the same fossil species; as, the Carboniferous, Oolitic, Cretaceous, Silurian, Laurentian, etc., formations; ( milit) an arrangement of troops, as in a square, column, etc.
  14. Act of forming; mode in which anything is formed.
  15. The act of forming or making; generation; production; the manner in which a thing is formed; structure; arrangement; a group of strata connected together by community of age, origin, or composition.
  16. The act or manner of forming; generation or production; in geol., any assemblage of rocks which have some characters in common.
  17. Structure arising from an accumulation of deposits.
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