verb (used with object), com·pli·cat·ed, com·pli·cat·ing.
- to make complex, intricate, involved, or difficult: His recovery from the operation was complicated by an allergic reaction.
- complex; involved.
- Entomology. folded longitudinally one or more times, as the wings of certain insects.
- to make or become complex
- biology folded on itselfa complicate leaf
- a less common word for
1620s, “to intertwine” (as a past participle adjective, early 15c.), from Latin complicatus “folded together; confused, intricate,” past participle of complicare (see ). Meaning “to make more complex” is recorded from 1832, from earlier sense “to combine in a complex way” (17c.). Related: ; complicating.