Webster's English Dictionary

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operative

1. op.er.a.tive \'a:p-(*-)r*t-iv, 'a:p-*-.ra-t-\ aj 1: producing an 
   appropriate effect : EFFICACIOUS  2: exerting force or influence : 
   OPERATING  3a: having to do with physical operations  3b: WORKING {an ~ 
   craftsman}  4: based upon or consisting of an operation  - op.er.a.tive.ly 
   av
2. operative n : OPERATOR : as  : ARTISAN, MECHANIC  : a secret agent : 
   private detective