A degree of relationship to another person. The person is more of an acquaintance that you’ve met, but don’t know outside of a specific context. You may have exchanged pleasantries, not exactly superficial, but probably not intimate details. Sort of making conversation to pass the time.
I saw you speaking with Mary the other day. Do you know her well?
No, not really. We are dog park close.
We met at the park and spoke often. I wanted to know her better but we never really got beyond dog park close.