In generalized sense. A fundamental source from which something proceeds; a primary element, force, or law which produces or determines particular…

figurative. A fundamental principle, an underlying basis, a foundation.

Beginning, commencement; origin, source; first principle, element; fundamental truth; = principle, n. (in various senses). Now rare.

A primeval, original, or fundamental thing; a beginning or origin; a first principle.

That on which anything is reared, constructed, or established, and by which its constitution or… a thing immaterial; a principle, a fact.

Primordial principle, source of origin. rare.

A basis; a fundamental thing or principle. Now rare.

= principle, n.

The first principle (of anything), germ, etc. = seminary, adj. 1.

The point at which investigation or analysis stops; a final or fundamental fact or principle.

figurative. The fundamental principles on which something is based. Cf. bed-rock, n.

A primary element, beyond which analysis becomes impossible; something fundamental.

figurative. Chiefly U.S. A support or basis; the most fundamental or basic level of something.

An ultimate principle or fact.