One of the mysteries of the English language finally explained.
A noun of action; a word or phrase that functions as a noun of action.
Mid 19th century; earliest use found in The New Englander. From classical Latin nōmen name + actiōnis, genitive singular of actiō, probably after post-classical Latin nomen agentis nomen agentis.
nomen actionis/ˌnəʊmɛn aktɪˈəʊnɪs//ˌnəʊmən aktɪˈəʊnɪs/
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