being the only one; single and isolated from others; "the lone doctor in the entire county"; "a lonesome pine"; "an only child"; "the sole heir"; "the sole example"; "a solitary instance of cowardice"; "a solitary speck in the sky"
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"; "a solitary traveler"
If you talk about a lone person or thing, you mean that they are alone. He was shot by a lone gunman
A lone parent is a parent who is looking after her or his child or children and who is not married or living with a partner. Ninety per cent of lone parent families are headed by mothers. = single