______ is an implicit or indirect reference to another work of literature, a historical or mythical person or event.

- Allusion is an implicit or indirect reference to another work of literature, a historical or mythical person or event.

Examples:
‘The winged boy I knew;
But who wast thou, O happy, happy dove?’
(Keats: “Ode to Psyche”)
The “winged boy” is an allusion to Cupid, the god of love.

Source: An ABC of English Literature - Dr. M Mofizar Rahman.