tryst 
(tr
ĭst)
n.1. An agreement between lovers to meet at a certain time and place.
2. A usually private meeting or meeting place that has been agreed on by lovers. See Synonyms at engagement.
intr.v. tryst·ed,
tryst·ing,
trysts To keep a tryst.
[Middle English trist, from Old French triste, a waiting place (in hunting); see deru- in the Appendix of Indo-European roots.]
tryster n.