Definition of ARCH

  1. (verb)form an arch or curve
  2. (noun)a curved shape in the vertical plane that spans an opening
  3. (noun)a curved bony structure supporting or enclosing organs (especially the inner sides of the feet)
  4. (noun)a passageway under a curved masonry construction
  5. (noun)(architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
  6. (adj)(used of behavior or attitude) characteristic of those who treat others with condescension
  7. (adj)naughtily or annoyingly playful