Allusion (noun)
allusion [uh-loo-zhuh n]

noun
1. a passing or casual reference; an incidental mention of something, either directly or by implication: The novel's title is an allusion to Shakespeare.
2. the act of alluding; the making of a casual or indirect reference to something: The Bible is a fertile source of allusion in art.
3. Obsolete. a metaphor or parable.

Can be confused
reference.
delusion, elusion, hallucination, illusion (see synonym study at illusion )

Origin: 1540-50; < Late Latin allūsiōn- (stem of allūsiō), equivalent to allūs (us), past participle of allūdere (see allude; al- + lūd- play + -tus past participle suffix) + -iōn- -ion

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