1. something assumed or taken for granted beforehand; a prior assumption that underlies an argument or statement
Usage: commonly used in logic, philosophy, and linguistics
2. in linguistics, a proposition that must be true for a statement to be either true or false
Usage: technical term in semantics and pragmatics

Examples

• The argument's presupposition that all humans are rational is debatable.
• Her presupposition was that everyone had access to the internet.
• The question 'Have you stopped cheating?' carries the presupposition that you were cheating.
• Without examining our presuppositions, we risk building arguments on false foundations.
• The presupposition underlying the study was that education improves earning potential.
• In logic, identifying unstated presuppositions is crucial to evaluating an argument's strength.