Webster's English Dictionary

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professional

1. pro.fes.sion.al \pr*-'fesh-n*l, -*n-*l\ \-e-\ aj 1a: of, relating to, or 
   characteristic of a profession  1b: engaged in one of the learned 
   professions  1c: characterized by or conforming to the technical or ethical 
   standards o f a profession 2a: participating for gain or livelihood in an 
   activity or field of endeav or often engaged in by amateurs 2b: engaged in 
   by persons receiving financial return {~ football> 3: following a line of 
   conduct as though it were a profession {a ~  patriot} - pro.fes.sion.al.ly 
   av
2. professional n : one that engages in a pursuit or activity 
   professionally