1. A step; a series of steps to ascend by. Flight of stairs, a stair from one landing to another.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• staium,
• astair,
• staper,
• stamia,
• stabb,
• srair,
• staure,
• stari,
• staber,
• setail,
• stoar,
• siaid,
• hteir,
• stio,
• stiry,
• statio,
• estar,
• steim,
• staurt,
• staik

• storie,
• steyer,
• straw,
• steer,
• stayer,
• stroh,
• stare,
• STIER,
• strei,
• stairway,
• STEAR,
• strew,
• Strey,
• storey,
• stahr,
• sterry,
• stoehr,
• star,
• steere,
• Stehr,
• steier,
• starr,
• Stohr,
• story,
• starry,
• stuhr,
• stereo,
• stria,
• styer,
• store,
• stir,
• stray.

The adjective form of the word "stair" is "staircase".

The plural of the "stair" can be the "stairs".

The singular of the "stair" can be the "stair".