ALLUSION
allusion
(noun) passing reference or indirect mention
Source: WordNet® 3.1
Etymology
Noun
allusion (countable and uncountable, plural allusions)
An indirect reference; a hint; a reference to something supposed to be known, but not explicitly mentioned
Source: Wiktionary
Al*lu"sion, n. Etym: [L. allusio, fr. alludere to allude: cf. F.
allusion.]
1. A figurative or symbolical reference. [Obs.]
2. A reference to something supposed to be known, but not explicitly
mentioned; a covert indication; indirect reference; a hint.
Source: Webster’s Unabridged Dictionary 1913 Edition