Etymology
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polytechnic (adj.)

1805, "pertaining to or comprehending instruction in many (technical) subjects," from French École Polytechnique, name of an engineering school founded 1794 (as École des Travaux publics) in Paris; from Greek polytekhnos "skilled in many arts," from polys "many" (from PIE root *pele- (1) "to fill") + tekhnē "art" (see techno-). As a noun (short for polytechnic institution) from 1836. Related: Polytechnical.

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Definitions of polytechnic

polytechnic (n.)
a technical school offering instruction in many industrial arts and applied sciences;
Synonyms: polytechnic institute / engineering school
From wordnet.princeton.edu