United Mexican States uni·ted·me·xicanstates uncommon noun 1. a Republic in southern North America; became independent from Spain in 1810 SynonymsMexicoUnited Mexican States Related words Broader terms North American country Parts MesoamericaOrganization of American States Part of YucatanAcapulcoCiudad JuarezCiudad VictoriaCuliacanDurangoGuadalajaraHermosillo WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.