1. 
   Omissible
   O·mis'si·ble adjective Capable of being omitted; that may be omitted.
   Found op http://www.encyclo.co.uk/webster/O/18
   
   
2. 
   omissible
   adjective capable of being left out
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=omissible
   
   
3. 
   Omissible
   • (a.) Capable of being omitted; that may be omitted.
   Found op http://thinkexist.com/dictionary/meaning/omissible/
   
   
4. 
   omissible
   1) Incident 2) Incidental 3) Not worth including 4) Unimportant enough to be skipped
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/omissible/1
   
   

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