► 名詞唯一  [(1)ゆいいつ]    
meaning:  only  rank: 2☆ それが
残された唯一の
望みだ ⇨ That’s the sole remaining hope  
(☛ Only one. Sole)☆ 
彼は
釣りが唯一の
趣味だ ⇨ Fishing is his one and only hobby  
(☛ Only one. Sole)More examples:- 昔は新聞や雑誌に投書するのが自分の意見を発表する唯一の手段だった ⇨ Writing to newspapers and magazines used to be the only way to express your opinion
 - 彼は彼女が唯一心を許す友達だ ⇨ He is the only friend she opens her mind to, trust