(genealogy) The phenomenon in which ancestral inbreeding causes the number of a descendant’s distinct ancestors to be smaller than that predicted by a binary tree (∑ᵢ₌₁ⁿ 2ⁱ, where n represents the number of generations).

plural of batting collapse

(cricket) A succession of batsmen or batswomen getting out without adding many runs to the team's score.

plural of gravitational collapse

The stage in the evolution of a star in which the pressure of the star is insufficient to maintain it at a stable size, and its material falls inward under its own gravitational attraction, eventually forming a black hole or a neutron star, and sometimes accompanied by a supernova explosion.

(history) The transition from the Bronze Age to the Iron Age in the eastern Mediterranean and southwestern Asia, characterised by the collapse of the Hittite, Egyptian, Mycenean and Canaanite civilisations.

A mysterious and widespread phenomenon of the sudden disappearance of colonies of bees.

A transition in the Aegean Region, Southwestern Asia and the Eastern Mediterranean from the Late Bronze Age to the Early Iron Age that historians believe was violent, sudden, and culturally disruptive.