Acquaintance

a person that you have met but do not know well

a business acquaintance

 

formal used in some expressions about knowing or meeting people

It was at the Taylors' party that I first made his acquaintance (= first met him).

I wasn't sure about Darryl when I first met her, but on further acquaintance (= knowing her a little more) I rather like her.

 

formal knowledge of a subject

Sadly, my acquaintance with Spanish literature is rather limited.