der Profi
Translation
pro, professional
Examples
Er ist ein echter Profi in seinem Job.
He is a real pro at his job.
Das wurde von Profis gemacht.
That was done by professionals.
Grammar Patterns
to be a pro ((in/at sth.)) Er ist ein Profi in seinem Fach.
Similar Words
Synonyms: Experte (expert), Fachmann (specialist); Antonym: Amateur
Etymology
Short form of 'Professional', from Latin 'profiteri' (to declare publicly).
Memory Tips
It's almost identical to the English word 'pro'. Just remember it's a masculine noun: 'der Profi'.