Brown or Auburn?

I got my hair cut today, because my layers were uneven. My hairdresser asked me if my auburn hair was natural. Aurburn? My hair is auburn? I suppose it does have a lot of natural reddish highlights, but I've never considered it auburn.
Having been told that, I went on the internet and looked up auburn hair. Yep, that's my hair color.
I always considered auburn hair to be way more red, like Miriams or Dads. I guess that is just red hair and mine is auburn, which has more brown in it.