pro pro /ˈproʊ/

adjective

1. () In favor of (an action or proposal etc.)  ( pro )
   in favor of (an action or proposal etc.)
    A pro vote
   a pro vote
   

adverb

1. In favor of a proposition, opinion, etc.  ( pro )
   in favor of a proposition, opinion, etc.
   

noun

1. () An athlete who plays for pay  ( pro , professional )
   an athlete who plays for pay
   
2. An argument in favor of a proposal  ( pro )
   an argument in favor of a proposal