(1):

(a.) Of or pertaining to synthesis; consisting in synthesis or composition; as, the synthetic method of reasoning, as opposed to analytical.

(2):

(a.) Comprising within itself structural or other characters which are usually found only in two or more diverse groups; - said of species, genera, and higher groups. See the Note under Comprehensive, 3.

(3):

(a.) Artificial. Cf. Synthesis, 2.