Meaning of PROFESSIONAL in English
1》 relating to or belonging to a profession.
↘worthy of a ~ person; skilful or competent.
2》 engaged in an activity as a paid occupation rather than as an amateur.
3》 informal, derogatory habitually engaged in a particular activity: a ~ time-waster.
■ noun a ~ person.
↘a person having impressive competence in a particular activity.
~ization or ~isation noun
~ize or ~ise verb
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004