indicator that establishes the horizontal when a bubble is centered in a tube of liquid | a device for showing the operating condition of some system |
a structure consisting of a room or set of rooms at a single position along a vertical scale | a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time |
a flat surface at right angles to a plumb line | a signal for attracting attention |
a position on a scale of intensity or amount or quality | (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction |
height above ground | |
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 | |