noun
unitarity; oneness; singleness
Abstract noun referring to the quality of being unitary, single, or indivisible. Often used in technical, philosophical, or mathematical contexts.
この理論は宇宙の単一性を前提としている。
This theory presupposes the oneness of the universe.
量子力学では状態の単一性が重要な概念だ。
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.