A story, poem, or picture that can be interpreted to reveal a hidden meaning, typically a moral or political one. George Orwell's 'Animal Farm' is an allegory of the Russian Revolution and the rise of Stalinism.
A symbolic representation, which can be a figure, event, or narrative, that conveys a deeper meaning beyond the literal level. The painting was an allegory of the artist's struggle with depression.
The use of allegorical technique or symbolic storytelling as a literary or artistic device. In medieval literature, allegory was widely employed to discuss theological issues.