Wiktionary
n. (context classical mechanics English) The rate of change of angular velocity, often represented by α.
Wikipedia
Angular acceleration is the rate of change of angular velocity. In SI units, it is measured in radians per second squared (rad/s), and is usually denoted by the Greek letter alpha (α).
Usage examples of "angular acceleration".
York's pressure suit felt hot, bulky, the angular acceleration couch uncomfortably restricting after so long in the Mission Module's shirtsleeved environment.
Suitcases, boxes, and bags had to be passed down into the lower hold and lashed against angular acceleration.
Close orbit around a dwarf could rip us asunder with angular acceleration.
Until the advent of artificially generated gravity fields, long-range space voyaging had required dodges like spinning a portion of the ship to produce angular acceleration.