sɪnˈθɛtɪk sɪnˈθɛtɪk of a proposition whose truth value is determined by observation or facts ‘all men are arrogant’ is a synthetic proposition systematic combining of root and modifying elements into single words involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis limnology is essentially a synthetic science composed of elements … that extend well beyond the limits of biology not genuine or natural counterfeit rhetoric that flourishes when passions are synthetic artificial as if portrayed in a film a novel with flat celluloid characters not of natural origin; prepared or made artificially man-made fibers synthetic leather a compound made artificially by chemical reactions