al·lu·sion 
(
ə-l
zh
ən)
n.1. The act of alluding; indirect reference: Without naming names, the candidate criticized the national leaders by allusion.
2. An instance of indirect reference: an allusion to classical mythology in a poem.
[Late Latin allūsiō, allūsiōn-, a playing with, from Latin allūsus, past participle of allūdere, to play with; see ALLUDE.]