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Definition: SD

(1) (Standard Definition) See SDTV and SD formats.

(2) (Secure Digital) See SD card.

(3) (Software Development) See developer.

(4) (Software Defined) See software-defined everything.

(5) (Super Density) An earlier CD specification from Toshiba, Time Warner and others that was merged with the MultiMedia CD (MMCD) format to become the DVD standard.