1a paid occupation, especially one that involves prolonged training and a formal qualification:his chosen profession of teachinga barrister by profession
[treated as singular or plural] a body of people engaged in a particular profession:the legal profession has become increasingly business-conscious
2an open but often false claim:his profession of delight rang hollow
3a declaration of belief in a religion: [mass noun]:they were baptized on profession of faith
the declaration or vows made on entering a religious order.
[mass noun] the ceremony or fact of being professed in a religious order:after profession she taught in Maidenhead