Definition of "one and only" []

• Unique, one of a kind (adjective)
• Only love, sole sweetheart. (noun)

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• "Just across the valley from St-Martin-de-Vésubie is the village of Venanson, where the chapel of Saint Sébastien is perched on a rock high above the one and only road."
• "In August, in its one and only venture, it was launched in New York Harbor against the British flagship Eagle, the sixty-four-gun vessel commanded by Lord Howe."
• "A love-struck Juliet who writes nightly in a Five-Star notebook about her hopes and dreams of future happiness with her one and only Milwaukee love?"