Significados de secret assignation en inglés

Looking for a spot suitable for a secret assignation, or just a nice glass of wine and some tasty nibbles?

You met this boy outside the compound walls without permission, a secret assignation, and you gave these medicines to him.

A secret assignation might have been the explanation if the time had been after, instead of before the household's departure for the evening.

Their job was to sniff out secret assignations related to plots against the government.

Doris, however, forewarned by Tryphaena's maid, looked out for squalls and held aloof from any secret assignations.

"That we're here for a secret assignation."

What could be the meaning of these secret assignations between the Princess, who was the destined bride of their Duke, and the obscure young refugee?