unitarity; oneness; singleness
Abstract noun referring to the quality of being unitary, single, or indivisible. Often used in technical, philosophical, or mathematical contexts.
This theory presupposes the oneness of the universe.
In quantum mechanics, the unitarity of states is an important concept.
統一性 emphasizes unity or coherence as a result of unification, whereas 単一性 emphasizes inherent singleness or indivisibility.
Compound of 単一 (single, unitary) + 性 (-ness, property). The exact historical derivation is uncertain, but the word follows a common pattern for forming abstract nouns in modern Japanese.