on-ly

adverb

and no one or nothing more besides: solely or exclusively: There is only one of you. 

Wandering through the dark woods in the violent storm, only the thin umbrella was all she had for protection.

no more than (implying that more was hoped for or expected: merely: no longer ago than: not until:

(with infiniive) with the negative or unfortunate result that: He hurried to meet her, only to find she hadn’t come at all.

(with modal) inevitably, although unfortunate or undesirable: if he gave her everything, she would only want more.

adjective

Alone of its or their kind: single or solitary:  The only apple on the tree was too high to reach.

Alone deserving consideration: Among the many cafes in own, this one is the only place to eat.

conjunction

except that; but for the fact that: He is twenty-seven, only he seems older.