What is the meaning of upstairs?

noun

• The part of a building above the ground floor.
  • usage: "no one was allowed to see the upstairs"

adjective

• On or of upper floors of a building.
  • usage: "the upstairs maid"; "an upstairs room"
  • synonyms: upstair

adverb

• On a floor above.
  • usage: "they lived upstairs"
  • synonyms: up the stairs, on a higher floor
• With respect to the mind.
  • usage: "she's a bit weak upstairs"