Assignation (noun)

1. An appointment or engagement, especially a secret one made for a romantic or sexual purpose.
2. The act of appointing or assigning someone or something to a particular task or purpose.

Origin:

From the french word "assignation", meaning appointment or engagement.

Examples:

1. He had an assignation with his mistress at a secret location.
2. She made an assignation to meet him later that night.
3. The assignation was arranged through a mutual friend.
4. The assignation was made in secret to avoid detection.
5. The assignation was for the purpose of a romantic rendezvous.