UNIX

or Unix

[yoo-niks]

Trademark.

a multiuser, multitasking computer operating system.

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British Dictionary definitions for unix

UNIX

noun trademark

a multi-user multitasking operating system found on many types of computer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012