caballeroEnglishOxford Dictionary of Englishcaballero /ˌkabəˈljɛːrəʊ / ▸ noun (plural caballeros) 1 a Spanish gentleman. 2 US English (in the south-western US) a horseman. – ORIGIN mid 19th century: Spanish, ‘gentleman, horseman’, based on Latin caballus ‘horse’. Compare with cavalier, chevalier.