[kwing-kuhngks, kwin-]
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Botany. an overlapping arrangement of five petals or leaves, in which two are interior, two are exterior, and one is partly interior and partly exterior.

1640–50; < Latin: five twelfths (quinc-, variant of quīnque- quinque- + uncia twelfth; see ounce1); originally a Roman coin worth five twelfths of an as and marked with a quincunx of spots

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World English Dictionary
quincunx (ˈkwɪnkʌŋks)
1.  a group of five objects arranged in the shape of a rectangle with one at each of the four corners and the fifth in the centre
2.  botany a quincuncial arrangement of sepals or petals in the bud
3.  astrology an aspect of 150° between two planets
[C17: from Latin: five twelfths, from quinque five + uncia twelfth; in ancient Rome, this was a coin worth five twelfths of an as² and marked with five spots]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1640s, originally astrological, of planetary alignments, from L., lit. "five ounces," from quinque "five" + uncia "ounce, a twelfth part," related to unus "one" (see one). Applied, especially in garden design, to arrangements like the five pips on a playing card (1660s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They have a sort of quincunx arrangement such that they tend to form two sets of curved lines intersecting at an acute angle.
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