1.Definition: being the only one; single and isolated from others
"The lone doctor in the entire county", "A lonesome pine"
2.Definition: characterized by or preferring solitude
"A lone wolf", "A lonely existence"
3.Definition: lacking companions or companionship
"He was alone when we met him", "She is alone much of the time", "The lone skier on the mountain", "A lonely fisherman stood on a tuft of gravel", "A lonely soul"