to make complex, intricate, involved, or difficult: His recovery from the operation was complicated by an allergic reaction.
Entomology. folded longitudinally one or more times, as the wings of certain insects.
Origin of complicate
1615–25; < Latincomplicātus (past participle of complicāre to fold together), equivalent to com-com- + -plic- (combining form of *plecāre to fold, akin to plectī to plait; see complex) + -ātus-ate1
Related formso·ver·com·pli·cate, verb (used with object),o·ver·com·pli·cat·ed,o·ver·com·pli·cat·ing.pre·com·pli·cate, verb (used with object),pre·com·pli·cat·ed,pre·com·pli·cat·ing.re·com·pli·cate, verb (used with object),re·com·pli·cat·ed,re·com·pli·cat·ing.un·com·pli·cate, verb (used with object),un·com·pli·cat·ed,un·com·pli·cat·ing.
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.