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Definition: Quadra

(1) (quadra) One quadrillion (10 to the 15th power). See quadrabyte and space/time.

(2) A family of early Macintosh computers that was popular in the early 1990s. See Macintosh.

Quadra 900
By this time, the hardware was fast enough to truly accommodate the graphics-based software introduced in 1984. (Image courtesy of Apple Inc.)