a person skilled in maintaining or operating machinery, motors, etc 
WordReference Random House Learner's Dictionary of American English © 2025
me•chan•ic /məˈkænɪk/USA pronunciation  
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2025- one who repairs machinery, or who is skilled in the use of tools and equipment:an auto mechanic.
 
me•chan•ic 
(mə kan′ik),USA pronunciation n. 
- a person who repairs and maintains machinery, motors, etc.:an automobile mechanic.
 - a worker who is skilled in the use of tools, machines, equipment, etc.
 - Slang Termsa person skilled in the dishonest handling of cards, dice, or other objects used in games of chance.
 
- Greek mēchanikós, equivalent. to mēchan(é̄) machine + -ikos -ic
 - Latin mēchanicus
 - Middle English: mechanical 1350–1400
 
Collins Concise English Dictionary © HarperCollins Publishers::
'mechanic' also found in these entries (note: many are not synonyms or translations):
Geissler tube
 - Murphy's Law
 - aeromechanic
 - bench
 - bumbling
 - chassepot
 - creeper
 - deft
 - diagnose
 - engineer
 - floorman
 - garageman
 - go
 - grease monkey
 - greaser
 - gut
 - mM
 - machine
 - master mechanic
 - mechanic's lien
 - mechanical
 - mechanician
 - mechanics
 - overhaul
 - ready
 - rigger
 - that
 - workbench