allotment vs assignation

allotment and assignation both are nouns.

Word	Noun	Adjective	Verb	Adverb
allotment	Yes	No	No	No
assignation	Yes	No	No	No

As nouns, allotment and assignation are synonyms defined as:

allotment and assignation: the act of distributing by allotting or apportioning; distribution according to a plan

Other synonyms of allotment include allocation, apportioning, apportionment, parceling, parcelling.

allotment (noun)	assignation (noun)
the act of distributing by allotting or apportioning; distribution according to a plan	a secret rendezvous (especially between lovers)
a share set aside for a specific purpose	the act of distributing by allotting or apportioning; distribution according to a plan