La metonimia (griego μετ-ονομαζειν met-onomazein 'nombrar allende', es decir, "dar o poner un nuevo nombre") o trasnominación, es un fenómeno de cambio semántico por el cual se designa una cosa o idea con el nombre de otra, sirviéndose de alguna relación semántica existente entre ambas. Son casos frecuentes las relaciones semánticas del tipo causa-efecto, de sucesión o de tiempo o de todo-parte. Se sustituye un término por otro, según la relación de causa-efecto, autor-obra o contigüidad: "Se tomó tres aguas".

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Metonymy (/mᵻˈtɒnᵻmi/ mi-TONN-ə-mee) is a figure of speech in which a thing or concept is called not by its own name but rather by a metonym, the name of something associated in meaning with that thing or concept. The words metonymy and metonym come from the Greek: μετωνῠμία, metōnymía, "a change of name", from μετά, metá, "after, beyond" and -ωνυμία, -ōnymía, a suffix used to name figures of speech, from ὄνῠμα, ónyma or ὄνομα, ónoma, "name". The location of a capital is often used as a metonym for a government, for example: Brussels for the government of the European Union, Nairobi for the government of Kenya, Washington for the government of the United States and Beacon Hill for the government of the U.S. state of Massachusetts. A place can represent an entire industry: for instance Wall Street is often used metonymically to describe the entire U.S. financial and corporate banking sector. Common nouns and phrases can also be metonyms: red tape can stand for bureaucracy, whether or not that bureaucracy actually involves physical tape. Metonymy and related figures of speech are common in everyday speech and writing. Synecdoche and metalepsis are considered specific types of metonymy. Polysemy, multiple meanings of a single word or phrase, sometimes results from relations of metonymy. Both metonymy and metaphor involve the substitution of one term for another. In metaphor, this substitution is based on some specific analogy between two things, whereas in metonymy the substitution is based on some understood association or contiguity. American literary theorist Kenneth Burke described metonymy as one of four "master tropes": metaphor, a substitute for perspective; metonymy, a substitute for reduction; synecdoche, a substitute for representation; and irony, a substitute for dialectic. He described these tropes and the way they overlap in A Grammar of Motives. In addition to its use in everyday speech, metonymy is a figure of speech in some poetry and in much rhetoric. Greek and Latin scholars of rhetoric made significant contributions to the study of metonymy.

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