noun
supremacy; predominance; superiority
Abstract noun referring to a state of being superior or dominant, often used in formal or analytical contexts.
この分野では、彼らの技術の優越性は明らかだ。
In this field, the superiority of their technology is clear.
軍事力の優越性が交渉を有利に進めた。
The predominance of military power gave them an advantage in negotiations.
優位性 also means 'superiority' or 'dominance', but 優位 focuses more on a favorable position or advantage, while 優越 emphasizes surpassing others in quality or power.
Compound of 優越 (superiority) + 性 (-ness, quality). The exact historical derivation is uncertain, but the kanji 優 means 'superior' and 越 means 'surpass'.