an act of delaying or interrupting the continuity | the outer boundary of an artifact or a material layer constituting or resembling such a boundary |
a narrow opening | a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight |
a conspicuous disparity or difference as between two figures | a superficial aspect as opposed to the real nature of something |
a difference (especially an unfortunate difference) between two opinions or two views or two situations | information that has become public |
an open or empty space in or between things | the extended two-dimensional outer boundary of a three-dimensional object |
a pass between mountain peaks; geomorphological term for the lowest point on a mountain ridge between two peaks | the outermost level of the land or sea |