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plural quincunxes or quincunces
An arrangement of five units with four forming the corners of a square and the fifth at the centre of the square, a pattern corresponding to the five-spot on dice, playing cards, or dominoes. examples
(astrology) An angle of five-twelfths of a circle, or 150°, between two objects.
A Galton board. quotations examples
In 1873–74 Sir Francis Galton (Charles Darwin’s cousin) designed an apparatus that he later named the quincunx.
1998, Deborah J. Bennett, Randomness, Harvard University Press, page 104
(historical, numismatics) A bronze coin minted during the Roman Republic, valued at five-twelfths of an as.