/ ˈmentl; NAmE / adjective
1.
[ usually before noun ] connected with or happening in the mind; involving the process of thinking :
the mental process of remembering
Do you have a mental picture of what it will look like?
I made a mental note to talk to her about it.
He has a complete mental block (= difficulty in understanding or remembering) when it comes to physics.
2.
[ usually before noun ] connected with the state of health of the mind or with the treatment of illnesses of the mind
SYN psychological :
mental health
a mental disorder / illness / hospital
She was suffering from physical and mental exhaustion.
—compare psychiatric
3.
[ not usually before noun ] ( BrE , slang ) crazy :
Watch him. He's mental.
My dad will go mental (= be very angry) when he finds out.
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WORD ORIGIN
late Middle English : from late Latin mentalis , from Latin mens , ment- mind.