Compulsion (Noun) ->>>> the state of being forced to do something.
I found this word from “A Hunger Artist” by Franz Kafka
This was nothing but a formality, instigated to reassure the masses, for the initiates knew well enough that during his fast the artist would never in any circumstances, not even under forcible compulsion, swallow the smallest morsel of food;
This word was used to describe that the artist would not (even if forced to do so) take a small piece of food into his mouth. I was able to understand the meaning of this quote even before looking up the word, by using the key phrases around the word like (forcible) , but still this is one of the few times I encountered this word.