year zero
noun
the beginning (1975) of the period during which Cambodia was under the control of the Khmer Rouge
the beginning of revolutionary change
the beginning of any new system or regime
Words nearby year zero
yeanling, year, year in, year out, year of confusion, year of grace, year zero, year's mind, year-around, year-end, year-round, year-rounder
Word Origin for year zero
C20: by analogy with Year One of the French Revolutionary calendar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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