have never been in a Quaker meeting but maybe they are like this…

Spirituality in my view doesn’t necessarily require the notion of some divinity or god. Actually I do quite fine without 🙂 most of the time. Nevertheless on occasion I am in states of awareness which can sensibly only be rendered using a word like “divine.”
The trouble starts when one starts interpreting these very real (sometimes even ‘more than real’) experiences with the tool-set our traditions offer us; and even more trouble starts when then taking these interpretations as ‘authorized’ by some Higher Being.

So my best take would be, “Spirituality is being pre-occupied with spirit. And according to Wikipedia the English word “spirit” comes from the Latin spiritus, meaning “breath” (compare spiritus asper), but also “soul, courage, vigor”, ultimately from a PIE root *(s)peis- (to blow). In the Vulgate, the Latin word translates Greek (??????), pneuma (Hebrew (???) ruah), as opposed to anima, translating psykh?. The word was loaned into Middle English via Old French.”

So, regarding your question, it is both, though totally immanent and atheistic spiritualities are totally legitimate.

When you say spirituality, do you mean something that involves some version of god or a divine? Or do you mean more like a philosophy of daily experience?