[{"word":"apertures","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"An opening, gap, or hole, usually small and narrow","synonyms":[],"antonyms":[],"example":"an aperture in a wall"},{"definition":"Something which restricts the diameter of the light path through one plane in an optical system.","synonyms":[],"antonyms":[]},{"definition":"The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens.","synonyms":[],"antonyms":[],"example":"This telescope has a 100cm aperture."},{"definition":"(communications) The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.","synonyms":[],"antonyms":[]},{"definition":"(of a right circular cone) The maximum angle between the two generatrices.","synonyms":[],"antonyms":[],"example":"If the generatrix makes an angle θ to the axis, then the aperture is 2θ."}],"synonyms":[],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/aperture","https://en.wiktionary.org/wiki/apertures"]}]