1. secret meetings, especially romantic ones
Usage: often implies secrecy or illicit nature
2. appointments or arrangements to meet
Usage: formal or literary usage

Examples

• The lovers arranged secret assignations in the old library.
• Their clandestine assignations continued for months without discovery.
• The spy’s assignations with his contact were carefully planned.
• She kept a diary of all her romantic assignations.
• The detective followed the suspect to several mysterious assignations.
• Business assignations were scheduled throughout the week.
• The novel featured numerous dramatic assignations between characters.