Learner's definition of MECHANICAL
1 a : of or relating to machinery
b : having or using machinery
The flight was delayed because of mechanical problems/difficulties.
a mechanical failure/breakdown
I was impressed by her mechanical know-how.
He's a mechanical genius. [=he is a person who is very smart about machines]
2 [more mechanical; most mechanical], disapproving : happening or done without thought or without any effort to be different or interesting
She gave a mechanical reply.
Copying down the numbers is a boring and mechanical job.
The actor gave a stiff and mechanical performance.
3 technical : of or relating to physical energy and forces : relating to the science of mechanics