solitaire

1. (board games) A game for one person, played on a board with pegs or balls, in which the object is, beginning with all the places filled except one, to remove all but one of the pieces by "jumping", as in draughts.Examples: "The early French solitaire boards were marked with thirty-seven holes instead of the modern board's thirty-three; and the problems were more difficult."countableuncountable

2. (card games, chiefly US) Any of various card games that can be played by one person.Examples: "You like to sit high on a hill / Count the daisies in the field / It's your own way of playing solitaire / You won't answer no question / Or say where you've been / The last thing you think you need is a friend"; "Mr. Greenwood said yesterday that he always finished his work in a timely fashion, and that he played solitaire only when there was nothing else left to do, usually a few times a week or during lunch breaks."; "I learned to play solitaire as a child. Its advantages over other games were obvious, even then. No need to persuade a friend to play or explain the boring rules, no hard feelings when someone won or lost, no lessons required, no costly equipment to badger my parents into buying. I could play whenever and wherever I wanted. All I needed was a deck of cards."Synonyms: patienceUScountableuncountable

3. (jewelry) A single gem, usually a diamond, mounted in a piece of jewellery by itself.Examples: "The Times reported ‘two pendant earrings formed of diamond solitaires of great splendor, supporting pear-shaped pearls of proportionate value, capped with brilliants.[…]’"countableuncountable

4. (obsolete) A black neck ribbon worn with a bag wig in the 18th century.Examples: "The fellow wears a ſolitaire, uſes paint, and takes rappee with all the grimace of a French marquis."countableobsoleteuncountable