Unix
noun[U]
ITtrademark(alsoUNIX)ukusabrandnamefor apowerfulcomputeroperatingsystem(=programthatcontrolsthe way acomputerworks)that can be used in mosttypesofcomputersand wasimportantfor thedevelopmentof theinternet:
Thesoftwareisintendedfor use withUnixbasedservers.