mental meaning
EN
[ˈmɛntəl] [-ɛntəl] 
US WMental
- Mental refers to aspects of, or things related to, the mind; or, in anatomy, the region of the chin, e.g. the mental foramen, can also mean:
- People who act in a way characteristic of mental disorder; this is often used pejoratively.
- Mental (TV series), a 2009 television series produced by Fox Telecolombia
- Mental (2008 film), a 2008 film, winner of the 2008 BIFF Mecenat Award
- Mental (2012 film), a 2012 Australian comedy film
- Mental (2014 film), a 2014 Bollywood film, retitled Jai Ho
- Mental (2015 film), an upcoming Bangladeshi psychological thriller film
FR mental 
- NounPLmentalsPREmé-
- Adjective
- Of or relating to the mind or an intellectual process.
- COL (comparable) Insane, mad, crazy.
- He is the most mental freshman I've seen yet. He went mental on us.
- COL (Britain, comparable) Enjoyable; fun.
- That was a mental party last night.
- (anatomy) Of or relating to the chin or median part of the lower jaw, genial.
- the mental nerve; the mental region
- (biology) Of or relating to the chin-like or lip-like structure.
- Of or relating to the mind or an intellectual process.
- More Examples
- Used in the Middle of Sentence
- And I get a huge kick out of laughing at the hilariously unpredictable inflexibility of the computer models of mental processes that my doctoral students and I codesign.
- he took a mental inventory of his supplies ; she took careful notes
- Ministers and a good many of their supporters worked in relays, and had so manned down the feeble and numerically small Opposition till we had not strength nor mental energy enough to resist.
- Used in the Beginning of Sentence
- Mental rotation task performance results suggest that the ELF MF exposure studied here (60 Hz, 3000 μT) modulates associated neuroprocessing, although the behavioural outcome is not altered.
- Used in the Middle of Sentence
Definition of mental in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Uncomparable adjectives
- Uncomparable adjectives
- Nouns
- Countable nouns
- Countable nouns
- Adjectives
Source: Wiktionary
Grammatically, this word "mental" is an adjective, more specifically, an uncomparable adjective. It's also a noun, more specifically, a countable noun.