Metonymy

Metonymy is a figure of speech used in rhetoric in which a thing or concept is not called by its own name, but by the name of something intimately associated with that thing or concept. For instance, "Westminster" is used as a metonym (an instance of metonymy) for the Parliament of the United Kingdom, because it is located there.

The words "metonymy" and "metonym" come from the Greek: μετωνυμία, 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." Metonymy may also be instructively contrasted with metaphor. Both figures involve the substitution of one term for another. In metaphor, this substitution is based on some specific similarity, whereas, in metonymy, the substitution is based on some understood association (contiguity).