In the branch of linguistics known as pragmatics, a presupposition (or PSP) is an implicit assumption about the world or background belief relating to an utterance whose truth is taken for granted in discourse. Examples of presuppositions include:
Jane no longer writes fiction.
Presupposition: Jane once wrote fiction.
Have you stopped eating meat?
Presupposition: you had once eaten meat.
Have you talked to Hans?
Presupposition: Hans exists.A presupposition must be mutually known or assumed by the speaker and addressee for the utterance to be considered appropriate in context. It will generally remain a necessary assumption whether the utterance is placed in the form of an assertion, denial, or question, and can be associated with a specific lexical item or grammatical feature (presupposition trigger) in the utterance.
Crucially, negation of an expression does not change its presuppositions: I want to do it again and I don't want to do it again both presuppose that the subject has done it already one or more times; My wife is pregnant and My wife is not pregnant both presuppose that the subject has a wife. In this respect, presupposition is distinguished from entailment and implicature. For example, The president was assassinated entails that The president is dead, but if the expression is negated, the entailment is not necessarily true.
The act of entailing, the state of being entailed, or something that is entailed.
"Entailment does not imply causation: if a set of premisses entail a conclusion, that does not mean (necessarily) that they cause that conclusion to be true."
"An argument hinges upon entailment whereas an if-then sentence hinges upon implication."
An assumption made beforehand; a preliminary conjecture or speculation.
The act of presupposing.
An assumption or belief implicit in an utterance or other use of language.
The act of entailing or of giving, as an estate, and directing the mode of descent.
The condition of being entailed.
A thing entailed.
The act of presupposing; an antecedent implication; presumption.
That which is presupposed; a previous supposition or surmise.
something that is inferred (deduced or entailed or implied);
"his resignation had political implications"
the act of presupposing; a supposition made prior to having knowledge (as for the purpose of argument)