The Collaborative International Dictionary of English v.0.48:

Klick \Klick\, n. & v.
   See Click.
   [1913 Webster]

WordNet (r) 3.0 (2006):

klick
    n 1: a metric unit of length equal to 1000 meters (or 0.621371
         miles) [syn: kilometer, kilometre, km, klick]

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

KLICK
       Karlsruher LIChtleiter-Kommunikationsnetz (Uni Karlsruhe,
Germany)