verb (used with object), com·pli·cat·ed, com·pli·cat·ing.

  1. to make complex, intricate, involved, or difficult: His recovery from the operation was complicated by an allergic reaction.


  1. complex; involved.
  2. Entomology. folded longitudinally one or more times, as the wings of certain insects.

verb (ˈkɒmplɪˌkeɪt)

  1. to make or become complex

adjective (ˈkɒmplɪkɪt)

  1. biology folded on itselfa complicate leaf
  2. a less common word for complicated

1620s, “to intertwine” (as a past participle adjective, early 15c.), from Latin complicatus “folded together; confused, intricate,” past participle of complicare (see complication). Meaning “to make more complex” is recorded from 1832, from earlier sense “to combine in a complex way” (17c.). Related: Complicated; complicating.

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