1670s in astrology, of planets, "one-tenth part of the zodiac distant from one another;" 1882 in statistics; from French décile or Medieval Latin *decilis, from Latin decem "ten" (from PIE root *dekm- "ten") on the model of quintilis, sextilis.
deci-
decibel
decide
decided
deciduous
decile
decimal
decimalization
decimate
decimation
decimeter
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