solitaire

noun
  1. A card game played by one person, where the goal is to arrange the cards in a specific order or pattern, often by suit or rank. noun
    She spent her afternoon playing solitaire on her computer.
    Solitaire is a great way to pass the time when you're alone.
  2. A single gem, especially a diamond, set alone in a piece of jewelry. noun
    He proposed with a beautiful solitaire diamond ring.
    The necklace featured a solitaire pendant that sparkled in the light.
  3. A person who lives in solitude; a recluse. noun
    The old man was a solitaire, rarely seen outside his house.
    As a solitaire, she preferred the company of books to people.