A passageway covered by an arch, particularly one made of masonry.
A doorway with a semilunar-shaped top.
A set of locks (enclosed sections of waterway) mounted one above the next.
A flight of stairs; a stairway.
A connected set of flights of stairs; a stairwell.
To modify (a signal, a graph, etc.) to reduce a smooth curve to a series of discrete steps.
To increase one's share in a co-ownership.