ETYM Latin solitarius, from solus alone: cf. French solitaire. Related to Sole, Solitaire.
1. Single; individual; sole.
2. Living or being by one's self; having no companion present; being without associates; single; alone; lonely.
3. Remote from society; retired; lonely.
4. Performed, passed, or endured alone.

1. One who lives or seeks to live a solitary life; recluse
2. Solitary confinement in prison