ah

UK [ɑː] / US [ɑ] interjection

1) used for showing that you see or understand something

Have you seen Jackie? Ah, there she is.

Ah yes, I remember now.

2) used for expressing a feeling, for example for showing that you are interested, surprised, pleased, or annoyed

Ah, that's really kind of you.

"I'm afraid I won't be able to come." "Ah, I see."