presuppositionally
Presuppositionally is an adverb that indicates something is being done or understood based on a presupposition. A presupposition is an implicit assumption that is taken for granted in the utterance of a sentence. For example, in the sentence "John stopped smoking," the presupposition is that John used to smoke. This presupposition is not directly stated but is understood by the listener.
When we act or speak "presuppositionally," we are operating under the assumption that certain things are true
Understanding presuppositions is important in linguistics and philosophy of language because it reveals how meaning is