from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. Up the stairs: raced upstairs.
- adv. To or on a higher floor: went upstairs to go to bed.
- adv. To or at a higher level: promoted upstairs to management.
- adj. Of or located on an upper floor: an upstairs bedroom.
- n. The part of a building above the ground floor.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. Up the stairs; on a higher floor or level.
- adv. In the brain.
- adj. located higher up a building.
- adj. a pitched ball that is high, and usually outside the strike zone
from the GNU version of the Collaborative International Dictionary of English
- n. See Upstairs in the Vocabulary.
- adv. Up the stairs; in or toward an upper story.
- adj. Being above stairs.
from The Century Dictionary and Cyclopedia
- In or to an upper story: as, to go up-stairs.
- Pertaining or relating to an upper story or flat; being above stairs: as, an up-stairs room.
- n. An upper story; that part of a building which is above the ground floor.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. with respect to the mind
- adv. on a floor above
- adj. on or of upper floors of a building
- n. the part of a building above the ground floor
From up + stair + -s (Wiktionary)