1. A basic belief or supposition that serves as the basis for a theory, argument, or system of thought; a fundamental premise taken to be true without proof
The foundational assumption of democracy is that all citizens have equal rights.
O pressuposto fundamental da democracia é que todos os cidadãos têm direitos iguais.
2. A core principle or underlying principle upon which other ideas, systems, or structures are built
The foundational assumption of the scientific method is that the universe follows natural laws.
O pressuposto fundamental do método científico é que o universo segue leis naturais.