(meteorology) The largest element of the intraseasonal variability in the tropical atmosphere: a large-scale coupling between atmospheric circulation and tropical deep convection, manifesting itself most clearly as anomalous rainfall.

(meteorology) The difference in pressure between the Azores High and the Icelandic Low, which changes periodically and controls the strength of the Westerlies. Usually abbreviated NAO.

plural of North Atlantic Oscillation

A quasiperiodic oscillation of the equatorial zonal wind between easterlies and westerlies in the tropical stratosphere

plural of quasi-biennial oscillation

(classical mechanics) A system which, when displaced from its equilibrium position, experiences a restoring force F proportional to the displacement x according to Hooke's law: F=-kx,, where k is a positive constant.

plural of harmonic oscillator

An electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors.

A device composed of an odd number of NOT gates whose output oscillates between two voltage levels, representing true and false. The NOT gates, or inverters, are attached in a chain; the output of the last inverter is fed back into the first.

plural of Hartley oscillator