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Meanings and definitions for OPX

OPX (meteorite class), a class of Martian meteorites
Off-premises extension, an extension telephone at a location distant from its servicing private branch exchange
Open Programming Extension, the DLL mechanism of the Open programming language of the Symbian operating system for mobile phones
Orthopyroxene, a pyroxene, a type of rock-forming mineral
Silver Xpress, a mail format used on FidoNet