The Collaborative International Dictionary of English v.0.48:

Cis- \Cis-\
   A Latin preposition, sometimes used as a prefix in English
   words, and signifying on this side.
   [1913 Webster]

WordNet (r) 3.0 (2006):

CIS
    n 1: an alliance made up of states that had been Soviet
         Socialist Republics in the Soviet Union prior to its
         dissolution in Dec 1991 [syn: Commonwealth of Independent
         States, CIS]

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

CIS
       Card Information Structure / Space (PCMCIA)


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

CIS
       Compuserve Information Systems (network)


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

CIS
       Command Information System (mil., USA)


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

CIS
       Contact Image Sensor


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

CIS

   1.  Case Integration Services.

   2.  Cooperative Information System.

   3.  Customer Interaction Software,
   Customer Information Systems.


Hitchcock's Bible Names Dictionary (late 1800's):

Cis, same as Kish