visibility
51visibility — [ˌvɪzəˈbɪləti] noun [U] the distance that you can see, depending on conditions such as the weather …
52visibility — vis•i•bil•i•ty [[t]ˌvɪz əˈbɪl ɪ ti[/t]] n. 1) the quality, state, or fact of being visible 2) mer the greatest distance it is possible to see under given atmospheric conditions 3) the relative capacity to be seen under given conditions of… …
53surface visibility — Visibility observed from eye level above the ground. It is the distance at which prominent objects are clearly visible during the day and at night with lights of specified luminosity …
54navigational visibility — Visibility as affecting speed with reference to distance within which boat in fog could be brought to stop, before any course of any vessel emerging from fog on either side would cross her projected course alongside the fog bank at its nearest… …
55navigational visibility — Visibility as affecting speed with reference to distance within which boat in fog could be brought to stop, before any course of any vessel emerging from fog on either side would cross her projected course alongside the fog bank at its nearest… …
56visibility range — The horizontal distance (in kilometers or miles) at which a large dark object can just be seen against the horizon sky in daylight …
57visibility meter — any instrument for measuring the visual range through the atmosphere, as a transmissometer. [1955 60] * * * …
58visibility curve — a plotting of the relationship between wavelength and the intensity of light necessary to elicit a sensation …
59visibility conditions — clarity of sight, how much can be seen in the distance and how clearly …
60visibility range — The horizontal distance (in miles or kilometers) at which a large dark object can just be seen against the horizon in daylight …
