solitaire

1. A person who lives alone; a recluse or hermit. (countable, uncountable)
2. 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. (countable, uncountable)
3. Any of various card games that can be played by one person. (US, countable, uncountable)
4. One of several American species of bird in the genus Myadestes in the thrush family. (countable, uncountable)
5. A single gem, usually a diamond, mounted in a piece of jewellery by itself. (countable, uncountable)

Plural solitaires