Synonyms for Assignation (same or very similar meaning)
WordNet sense 1 (a secret rendezvous (especially between lovers)):
trystWordNet sense 2 (the act of distributing by allotting or apportioning; distribution according to a plan):
allocation, allotment, apportionment, apportioning, parceling, parcellingFrom the ODE community, based on WordNetadd/edit