n. A complex combination or intricate intermingling of things, parts, elements, etc.; especially, a perplexing or incongruous intermixture or combination; a confused complex or complexity: as, a complication of knots in a rope; a complication of ideas, diseases, or misfortunes; the complication of one's affairs with those of another.n. That which renders complex, involved, or intricate; that which causes difficulty, entanglement, or interference; an involved and troublesome or embarrassing state of affairs.n. An entwining or infolding; an embrace.n. In entomology, the manner in which an insect folds its wings when at rest.n. In biology, a process the reverse of growth or development, by which the heterogeneous tends toward homogeneity.n. In psychology, the simultaneous association of perceptions or ideas of different senses.