/ əˌfɪʃəˈnɑːdəʊ; NAmE -doʊ/ noun
( pl. -os ) a person who likes a particular sport, activity or subject very much and knows a lot about it
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WORD ORIGIN
mid 19th cent. (denoting a devotee of bullfighting): from Spanish , amateur , past participle of aficioner become fond of used as a noun, based on Latin affectio(n-) (favourable) disposition towards, from afficere to influence, from ad- at, to + facere do.