close woman friend, especially of another woman
I have more sisters than I can count. I have work sisters. I have friend sisters. I have church sisters (these are my sisters-in-Christ).
Men do not understand sisterhood. Have you ever seen "Divine Secrets of Ya Ya Sisters"? I haven't seen it in years. Actually, I only saw it once, when it first came out in the theater. I think it was ten years ago.
A true sister loves and accepts you for who you are, all your faults and failures.
I am blessed with many sisters.