1.Definition: being the only one; single and isolated from others
"A solitary instance of cowardice", "A solitary speck in the sky"
2.Definition: characterized by or preferring solitude
"A man of a solitary disposition", "A solitary walk"
4.Definition: lacking companions or companionship
"A solitary traveler"
5.Definition: of plants and animals; not growing or living in groups or colonies