Assignation often implies a secret or discreet meeting, especially for a romantic encounter. They whispered about their assignation, wary of being overheard.
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Historical Romance
The term is frequently used in historical or literary contexts to describe a secret romantic meeting. The lovers planned a midnight assignation away from prying eyes.
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Euphemistic Use
Assignation can be a euphemism for an illicit meeting, often used to avoid the negative connotations of adultery. The novel explored the protagonist's assignation with her former lover.