One of the mysteries of the English language finally explained.
The process of choosing by lot to fill a vacancy, especially one created in a group previously proposed or selected.
Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From classical Latin subsortītiōn-, subsortītiō process of choosing by lot (to fill a vacancy) from subsortīt-, past participial stem of subsortīrī to appoint by lot as a substitute + -iō. Compare earlier sortition.
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