extent - the distance or area or volume over which something extends; "the vast extent of the desert"; "an orchard of considerable extent"

approximate range, ballpark - near to the scope or range of something; "his answer wasn't even in the right ballpark"

confines - a bounded scope; "he stayed with the confines of the city"

contrast - the range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness)

internationality, internationalism - quality of being international in scope; "he applauded the internationality of scientific terminology"

latitude - scope for freedom of e.g. action or thought; freedom from restriction

purview, horizon, view - the range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge"

expanse, sweep - a wide scope; "the sweep of the plains"

gamut - a complete extent or range: "a face that expressed a gamut of emotions"

spectrum - broad range of related values or qualities or ideas or activities

palette, pallet - the range of colour characteristic of a particular artist or painting or school of art

environment - the totality of surrounding conditions; "he longed for the comfortable environment of his livingroom"

canvass, canvas - the setting for a narrative or fictional or dramatic account; "the crowded canvas of history"; "the movie demanded a dramatic canvas of sound"

show window, showcase - a setting in which something can be displayed to best effect; "it was a showcase for democracy in Africa"

aperture - a device that controls amount of light admitted

astronomical telescope - any telescope designed to collect and record electromagnetic radiation from cosmic sources

collimator - a small telescope attached to a large telescope to use in setting the line of the larger one

view finder, viewfinder, finder - optical device that helps a user to find the target of interest

magnifier - a scientific instrument that magnifies an image

optical prism, prism - optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image

solar telescope - a telescope designed to make observations of the sun

transit instrument - a telescope mounted on an axis running east and west and used to time the transit of a celestial body across the meridian

cardiac monitor, heart monitor - a piece of electronic equipment for continual observation of the function of the heart

cathode-ray tube, CRT - a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen

electronic equipment - equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

monitor, monitoring device - display consisting of a device that takes signals from a computer and displays them on a CRT screen

microwave radar, radar, radio detection and ranging, radiolocation - measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects