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English word profession comes from Latin profiteor (I declare publicly) and came to mean 'a paid occupation' through the implication of one professing to be skilled at something
profiteor (Latin)
I declare publicly, own (up to) or confess openly, acknowledge, avow, profess.. I make a public statement or a return of.. I make a show of, show, display.. I offer freely, promise.. I profess, claim; I declare myself (as), practice (as).
profiteri (Latin)
professionem (Latin)
profession (Old French)
Profession; declaration (usually of faith).
professioun (Anglo-Norman)
profession (English)
A declaration of belief, faith or of one's opinion.. A promise or vow made on entering a religious order.. An occupation, trade, craft, or activity in which one has a professed expertise in a particular area; a job, especially one requiring a high level of skill or training.. The practitioners of such an occupation collectively.