only; sole

He is the only American who has swum the English Channel.

The only difference between a bad cook and a poisoner is the intent.

Mike is the only man on the board.

Today, women's only consideration in marriage is probably if you love him or not, if he loves you or not, whether he is sincere and heartfelt towards you, whether there will be pressure with him, whether there will be happiness, and not what his possessions are!

The only person who's looking forward to Miss Cobb's return.