Etymology
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synthetic (adj.)

1690s, as a term in logic, "deductive," from French synthétique (17c.) and directly from Modern Latin syntheticus, from Greek synthetikos "skilled in putting together, constructive," from synthetos "put together, constructed, compounded," past participle of syntithenai "to put together" (see synthesis). From 1874 in reference to products or materials made artificially by chemical synthesis; hence "artificial" (1930). As a noun, "synthetic material," from 1934. Related: Synthetical (1620s in logic).

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Definitions of synthetic
1
synthetic (adj.)
not of natural origin; prepared or made artificially;
synthetic leather
Synonyms: man-made / semisynthetic
synthetic (adj.)
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"- P.S.Welch;
Synonyms: synthetical
synthetic (adj.)
systematic combining of root and modifying elements into single words;
synthetic (adj.)
of a proposition whose truth value is determined by observation or facts;
`all men are arrogant' is a synthetic proposition
Synonyms: synthetical
synthetic (adj.)
artificial as if portrayed in a film;
Synonyms: celluloid
synthetic (adj.)
not genuine or natural; "counterfeit rhetoric that flourishes when passions are synthetic"- George Will;
2
synthetic (n.)
a compound made artificially by chemical reactions;
Synonyms: synthetic substance
From wordnet.princeton.edu