ETYM Latin allusio, from alludere to allude: cf. French allusion.
Passing reference or indirect mention.

1. A slight indication; SYN. clue.
2. An indirect suggestion; SYN. intimation, breath.

1. The act of referring; SYN. consultation.
2. The relation between a word or phrase and the object or idea it refers to
3. The class of objects that an expression refers to; SYN. denotation, extension.
4. A publication (or a passage from a publication) that is referred to; SYN. source.