(astronomy) The 1:2 resonance, beyond which few objects are known; it may be the outer edge of the classical Kuiper belt or just the beginning of a broad gap.

(politics, economics) A situation where a number of large spending or taxation bills begin or end simultaneously.

plural of cliff swallow

Alternative form of Cliff notes

A small village in Cliffe parish, Selby district, North Yorkshire, England (OS grid ref SE6633).

(sociology) A phenomenon where women in leadership roles are likelier than men to achieve such roles during periods of crisis or downturn, when the risk of failure is highest.

(music) Obsolete form of bass clef.

(music) Obsolete form of treble clef.

The very steep, vertical, or overhanging section of rock, earth, or ice slope usually free of any vegetation or loose material.

A steep cliff with numerous small shelves that serve as nesting locations for bird colonies.