noun
stair
steh-uh
noun
1
A single step in a flight of steps.
"Mind the loose stair near the top."
2
A flight of steps connecting two levels (usually used in the plural, "stairs").
"She ran up the stair two at a time."
How to Use Stair
Learner’s notesIn plain EnglishA step, or a flight of steps.
Common mistake
In everyday speech "stairs" (plural) is far more common than the singular "stair" for a whole flight.
Word Forms
stairs plural, Stairs plural
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Mind the loose _____ near the top.
Etymology
From Old English stæger, ultimately from a very old root meaning "to climb or ascend."