fundamental premise; basic assumption; something that goes without saying
Refers to a foundational condition or assumption that is taken as given in an argument, plan, or discussion. Sense 2 emphasizes that it should be obvious and not require justification.
This plan is based on the fundamental premise that there is enough budget.
As a basic premise for discussion, mutual trust is necessary.
major premise (logic)
Technical term in logic for the major premise of a syllogism.
In a syllogism, a conclusion is drawn from the major premise and the minor premise.
This plan is based on the fundamental premise that the budget will be secured.
As a basic premise, everyone's consent is required.
Once that fact came out, the whole basic premise of the argument fell apart.