Any of various games for one person, especially a card game in which the objective is to arrange cards in a particular order, or a peg-board game in which pegs are removed by jumping.
He spent the evening playing solitaire on his phone.
A single gem, especially a diamond, set alone in a piece of jewelry.
He proposed to her with a beautiful solitaire ring.
A person who lives in solitude; a recluse.
The old man was known as a solitaire, rarely seen outside his home.