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Online services
Any business that provides its subscribers with a wide variety of data transmitted over telecommunications lines, an infrastructure in which they can communicate with one another as well as the means to connect with an almost unlimited number of third-party information providers.
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argon (Ar, 1S0 in ground state)
Astronomy; General astronomy
colourless, odourless gas comprising 1% of the atmosphere
argument of the perihelion (ω, longitude of the perihelion)
Astronomy; General astronomy
Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.
array telescope
Astronomy; General astronomy
a telescope composed of an array of separete individual elements acting in concert
arsenic (As, 4S3/2 in ground state)
Astronomy; General astronomy
a metalloid element with two main forms, grey α arsenic and β arsenic
