This question is based on General Literature Principles and Literary Appreciation. In literary criticism, a casual reference to a figure or an event is rega...

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In literary criticism, a casual reference to a figure or an event is regarded as an allusion. Allusion is a figure of speech that makes a reference to a person, place, event, or a literary work. It is a brief and indirect reference that is made to something without mentioning it explicitly. Allusions can be historical, mythological, or literary, and they can add depth, complexity, and richness to a literary work by connecting it to a broader cultural and historical context.