Arising from or going to the root or source
Of or being an irreducible element
The fossils are few, and in some cases probably derived from the underlying formations.
Tests gave no indication of an underlying cause.
Neoplatonism owes its form to Plato, but its underlying motive is the widespread feeling of self-despair and the longing for divine illumination characteristic of the age in which it appears.
The fact that an unprecedented number of earth's inhabitants today live in poverty is an indictment of governments, not a reflection of some underlying natural limit.
The idea underlying the word, which to us is invested with deep ethical meaning, had only this non-ethical, ritual significance in Ezekiel.