mayor meaning
EN
[ˈmeɪ.ɚ] [ˈmɛɚ] [ˈmɛə] [ˈmeɪ.ə] [-ɛə(ɹ)] [-eɪə(ɹ)] 
US WMayor
- In many countries, a mayor (/ˈmɛər/ or /ˈmeɪər/, from the Latin maior [majˈjɔr], meaning "bigger") is the highest-ranking official in a municipal government such as that of a city or town.
- Worldwide, there is a wide variance in local laws and customs regarding the powers and responsibilities of a mayor, as well as the means by which a mayor is elected or otherwise mandated.
EN Mayor 
- NounPLmayors
- The leader of a city, or a municipality, sometimes just a figurehead and sometimes a powerful position. In some countries, the mayor is elected by the citizens or by the city council.
- By restriction, a male municipal leader.
- (historical) The steward of some royal courts, particularly in early Medieval France.
- The leader of a city, or a municipality, sometimes just a figurehead and sometimes a powerful position. In some countries, the mayor is elected by the citizens or by the city council.
- More Examples
- Used in the Middle of Sentence
- The mayor wil be answering for his crimes for many years.
- The old mayor pissed millions of dollars away on stuff nobody wanted.
- Even though it caused much controversy, Mayor Daley was eventually lauded as a hero for his decision to depave Lake Shore Drive.
- Used in the Middle of Sentence
Definition of mayor in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Countable nouns
- Nouns
Source: Wiktionary
Grammatically, this word "mayor" is a noun, more specifically, a countable noun.