mental Definition in the Cambridge English Dictionary
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Definition of “mental” - English Dictionary

Definition of "mental" - American English Dictionary

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mentaladjective [not gradable]

 us   /ˈmen·təl/
of or about the ​mind, or ​involving the ​process of ​thinking: Stress can ​affect both ​yourphysical and mental ​health. Many ​peoplesuffer from some ​form of mental ​illness during ​theirlives. I made a mental ​note of her ​address (= I will ​try to ​remember it).
mentally
adverb [not gradable]  us   /ˈmen·təl·i/
mentally ​ill
(Definition of mental from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "mental" - British English Dictionary

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mentaladjective

uk   /ˈmen.təl/  us   /-t̬əl/
B2 [before noun] relating to the ​mind, or ​involving the ​process of ​thinking: The ​family has a ​history of mental ​disorder. A ​doctor was ​asked about the mental ​state of the ​prisoner. She had a mental picture (= a ​picture in her ​mind) of how the ​house would ​look when they ​finishedredecorating it. UK slang crazy
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(Definition of mental from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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