A person who repairs or maintains machines, vehicles, or equipment. For an official job title, 整備士 is often more precise.
He works as a motorcycle mechanic.
The race team's mechanic inspected the car.
Na-adjective use meaning mechanical in appearance, structure, or feel. メカニカル is a common related form and may sound more natural in many adjectival contexts.
See also: メカニカル
I like watches with a mechanical design.
technique; technical facility
Specialized use for technical skill or facility, such as in piano playing. It does not mean technique in every everyday sense; 技術 or テクニック is more general.
This etude is for training piano technique.
He works as a mechanic for a racing team.
It's fun to figure out how this game's mechanics work.
That robot is characterized by its mechanical design.