WordNet (r) 3.0 (2006):

cos
    n 1: ratio of the adjacent side to the hypotenuse of a right-
         angled triangle [syn: cosine, cos]
    2: lettuce with long dark-green leaves in a loosely packed
       elongated head [syn: cos, cos lettuce, romaine,
       romaine lettuce]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Card Operating System (OS, ICC)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Cassette Operating System (OS)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Class of Service


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Clip On Socket (CPU)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Commercial Operating System (OS, DEC, PDP 11)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Concurrent Operating System (OS, UNIVAC 9200, UNIVAC 9300)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Corporation for Open Systems (org., OSI, user group)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COS
       Cray Operating System (OS, Cray)


The Free On-line Dictionary of Computing (30 December 2018):

COS

   1. Cray Operating System.

   2. Corporation for Open Systems.