Solitude
Etymology
From Latin solitudo, "loneliness, a being alone," built on solus, "alone," and reaching English through Old French. The Latin word could mean either a desolate place or the condition of a solitary person. English kept both, but the modern flavor leans toward the willing, restorative kind of aloneness.
noun · /SOL-ih-tood/
The state of being alone, especially in a way that feels chosen and peaceful rather than forced.
What it names
The particular quality of aloneness that a person seeks out for rest, thought, or renewal, as opposed to the ache of being left alone.
Example
After a week of meetings she craved a few days of solitude in the mountains, with no one to answer to.
Related idea
Loneliness is the pain of unwanted isolation; solitude is the same physical aloneness experienced as a gift rather than a wound.