1. 
   Oco
   Oco is a town and municipality located in the province and autonomous community of Navarre, northern Spain. ...
   Found op http://en.wikipedia.org/wiki/Oco
   
   
2. 
   Oco
   one cancels the other order
   Found op http://www.numa.com/ref/acronym.htm
   
   
3. 
   OCO
   See One Cancels the Other.
   Found op http://www.oasismanagement.com/glossary/
   
   
4. 
   oco
   1) Abbreviation for object code only
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/oco/1
   
   

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