The word "lone" has several meanings, depending on its usage.
1) As an adjective, it means being alone or solitary; isolated from others. For example, "He lives in a lone cabin deep in the woods."
2) As a noun, it can refer to someone who is single and not part of a couple. Example: "She's been a lone wolf since her divorce."
3) In some regions, particularly Scotland and Ireland, "lone" can be used as an adjective to describe something that stands alone or is unique in its kind. For example, "The lone mountain peak towered over the valley."