also: ゆいつ · ゆういつ
noun which may take the genitive case particle 'no', noun, adverb
Describes something that is the one and only; can be used as a noun, adjectivally with の, or adverbially.
彼は私の唯一の友達です。
He is my only friend.
この問題を解く唯一の方法はこれだ。
This is the only way to solve this problem.
唯一、彼だけがその秘密を知っていた。
Only he knew the secret.