From The Collaborative International Dictionary of English v.0.44 [gcide]:
mayor \may"or\, noun [OE. maire, F. maire, fr. L. major greater, higher, nobler, compar. of magnus great; cf. Sp. mayor. See {Major}, and cf. {Merino}.] The chief magistrate of a city or borough; the chief administrative officer of a municipal corporation. In some American cities there is a city court of which the major is chief judge. The post is usually elective, its holder chosen by the electorate of the entire city.
From WordNet (r) 2.0 [wn]:
noun
1: the head of a city government [syn: {city manager}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
36 Moby Thesaurus words for "mayor": alderman, archon, bailie, burghermaster, burgomaster, cabinet member, cabinet minister, chancellor, city councilman, city father, city manager, commissar, commissioner, councillor, councilman, councilwoman, county commissioner, county supervisor, elder, headman, induna, legislator, lord mayor, magistrate, maire, minister, minister of state, portreeve, reeve, secretary, secretary of state, selectman, supervisor, syndic, undersecretary, warden
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