ac·quain·tance

...a relationship less intimate than friendship

I call her an acquaintance because we aren't really friends but we tend to come together every once in awhile; our children are in the same classes, we were together new year's eve, she is a friend of my friend, yadda yadda yadda. Sometimes you can spend time with people without becoming their friends. Some people you keep at a distance, not really sure why.

There are people you would spend every possible moment with and people you could go a lifetime without seeing.