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.

one of the regular periodic fluctuations in the density of the visible baryonic matter of the universe

(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.

(politics) A peace process between Israel and Palestine, begun with the Oslo Accords.

(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 Oslo breakfast

plural of red osier dogwood

plural of OSI layer

(physics) In solid-state physics, the oscillation of a particle (e.g. an electron) confined in a periodic potential when a constant force is acting on it.

(slang, humorous, euphemistic) To fuck off.