1. 
   GCOS
   (operating system) /jee'kohs/ An operating system developed by General Electric from 1962; originally called GECOS (the General Electric Comprehensive Operating System). The GECOS-II operating system was developed by General Electric for the 36-bit GE-635 in 1962-1964. Contrary to rumour, GECOS was...
   Found op http://foldoc.org/GCOS
   
   
2. 
   GCOS
   acronym: Global Climate Observing System (WMO, IOC, UNEP, and ICSU)
   Found op http://cdiac.ornl.gov/pns/acronyms.html#G
   
   
3. 
   Gcos
   GCOS is a quick-and-dirty clone of System/360 DOS that emerged from GE around 1970. Originally it was called GECOS (the General Electric Comprehensive Operating System). Later it was changed to support primitive timesharing and transaction processing. After the buyout of GE's computer division by Ho...
   Found op http://www.probertencyclopaedia.com/browse/GG.HTM
   
   
4. 
   gcos
   1) Global climate observing system
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/gcos/1
   
   

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