<. Sense of "behavior" is first recorded late 14c. Meaning "a document with blanks to be filled in" is from 1855.


c.1300, from Old French fourmer, from Latin formare, from forma “form, contour, figure, shape” (see form (n.)). Related: Formed; forming.

In addition to the idiom beginning with form

  • form an opinion

also see:

  • run to form
  • true to form
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