solitaire

A gem, such as a diamond, that is set alone.

Any of a number of card games played by one person.

Any of several thrushes found in the Americas and noted for having a beautiful song.

A large flightless bird (Pezophaps solitaria) of the Mascarene Islands that was closely related to the dodo and became extinct by the end of the 18th century.

A large flightless bird (Threskiornis solitarius) of Réunion Island, once thought to be related to the dodo but now regarded as a type of ibis. It became extinct in the early 18th century.

A person who lives in solitude; a recluse; a hermit; a solitary.

A precious stone, oftenest a diamond, set by itself, and not combined with other jewels.

A loose necktie of black silk, resembling a ribbon, sometimes secured to the bag of the wig behind, and in front either falling loosely or secured by a brooch or similar jewel: a fashion for men in the eighteenth century.

A game which one person can play alone. In particular and properly

In ornithology: