An allusion is when a person or author makes an indirect reference in speech, text, or song to an event or figure. Soft Schools

allusion

Alliteration is the use of the same consonant sounds in words that are near each other. It is the sound, not the letter, that is important: therefore ‘city’ and ‘code’ do not alliterate, but ‘kitchen’ and ‘code’ do. The Poetry Archive  

alliteration

An allegory is the description of a subject in the guise of another subject. (The National Gallery)

allegory

Adynaton is from a Greek word adunaton, which means impractical or impossible. It is a rhetorical device that is a form of hyperbole in which exaggeration is taken to a great extreme where it seems impossible. (literarydevices.net)

adynaton

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