noun.
one of those generalizations of ordinary experience which nobody doubts, and which are soon replaced by scientific formulations, which latter are also, but less properly, termed middle axioms.
noun.
A self-evident, undemonstrable, theoretical, and general proposition to which every one who apprehends its meaning must assent.
noun.
Any higher proposition, obtained by generalization and induction from the observation of individual instances; the enunciation of a general fact; an empirical law.
noun.
In logic, a proposition, whether true or false: a use of the term which originated with Zeno the Stoic.