adjective

1. of, engaged in, or worthy of the high standards of a profession
2. ☆ designating or of a school, esp. a graduate school, offering instruction in a profession
3. earning one's living from an activity, such as a sport, not normally thought of as an occupation
4. engaged in by professional players professional hockey
5. engaged in a specified occupation for pay or as a means of livelihood a professional writer
6. being such in the manner of one practicing a profession a professional hatemonger

noun

1. a person practicing a profession
2. 1. a person who engages in some art, sport, etc. for money, esp. as a means of livelihood, rather than as a hobby
   2. pro ()
3. a person who does something with great skill