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adj.
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"
adj.
consisting of or involving a single element or component; "in a unary operation in a mathematical system one element is used to yield a single result"