1680s, "not confined to or following any one model or system," originally in reference to ancient philosophers who selected doctrines from every system; from French eclectique (1650s), from Greek eklektikos "selective," literally "picking out," from eklektos "selected," from eklegein "pick out, select," from ek "out" (see ex-) + legein "gather, choose" (see lecture, n.). Broader sense of "borrowed from diverse sources" is first recorded 1847. As a noun from 1817.