I suppose the term is entirely subjective. I've got a large handful of close friends. Most are in the same friend group and we have a group chat. We see each other about once per year, usually around the holidays and depending on who is coming back home. We are all in different states now. The group chat helped to stay "in touch", but we don't usually have conversations, people just use it like a mini-social media and put little blurbs here and there about random stuff. I do feel sad that they don't have time to talk with me on the phone or "care" to ask personal questions about my life. However, they are still my close friends and I know that we will continue to be in each other's lives for years to come. When I see them in person, it's like no time has passed. We enjoy each other and I love them deeply.
My "best friend" in the group had been casually texting or snap chatting with me pretty consistently over the past few months, (this was a major improvement!), but it seems that she's sort of receded from our interactions again. No real reason why. Just not responding or initiating the way she had been. It doesn't make me love her less. I wish connection could be more consistent, but that's just not the way our lives are these days. It's ok though, because I have proved my loyalty, and so now she is loyal to me as well. I feel this way about all of my "close friends".
I have lots of friendly acquaintances most places I go, but i don't make real friends easily. I do have a small handful of friends who aren't my close friends, but I tend to keep non-close friends shoved into the acquaintance zone. I don't have the social capacity for tons of casual friends! My large handful of close friends I see once a year is enough to keep me busy and socially drained, even if we barely talk 