the outer boundary of an artifact or a material layer constituting or resembling such a boundary | indicator that establishes the horizontal when a bubble is centered in a tube of liquid |
a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | a structure consisting of a room or set of rooms at a single position along a vertical scale |
a superficial aspect as opposed to the real nature of something | a flat surface at right angles to a plumb line |
information that has become public | a position on a scale of intensity or amount or quality |
the extended two-dimensional outer boundary of a three-dimensional object | height above ground |
the outermost level of the land or sea | an abstract place usually conceived as having depth |
| a specific identifiable position in a continuum or series or especially in a process |
| a relative position or degree of value in a graded group |