
A continuously variable transmission (CVT) is a transmission that can change seamlessly through an infinite number of effective gear ratios between maximum and minimum values. This contrasts with other mechanical transmissions that offer a fixed number of gear ratios. The flexibility of a CVT allows the input shaft to maintain a constant angular v...
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http://en.wikipedia.org/wiki/Continuously_variable_transmission

A drive system where a belt running on pairs of cones allows the ratio between the input and output shafts to be varied continuously between the maximum and minimum ratios. See also: Automatic Gearbox.
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https://www.encyclo.co.uk/local/20687

a transmission, typically using rubber belts and pulleys, in which the ratio of the rotational speeds of two shafts, as the drive shaft and driven shaft of a vehicle, can be varied continuously within a given range, providing an infinite number of possible ratios. Abbr.: CVT
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https://www.infoplease.com/dictionary/continuously-variable-transmission
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