di professione

Italian

Literally, “of profession”. Compare French de profession.

done as part of one's profession; professional
- 2021 October 27 (last accessed), “Che fare?”, in Wikipedia‎^[1], archived from the original on 17 October 2021:
  Lenin propone la formazione di un partito rivoluzionario composto dall'avanguardia della classe operaia, in cui partecipano rivoluzionari di professione.
  Lenin proposes the formation of a revolutionary party composed of a vanguard of the working class, in which professional revolutionaries participate.