Quintile

[kwin-til, -tahyl] /ˈkwɪn tɪl, -taɪl/

noun
1.
Statistics. a quantile for the special case of five equal proportions.
2.
Astrology. a quintile aspect.
adjective
3.
Astrology. of or relating to the aspect of two heavenly bodies that are one fifth of the zodiac, or 72°, apart.
/ˈkwɪntaɪl/
noun (astrology)
1.
an aspect of 72° between two heavenly bodies
2.
a fifth part of a distribution
n.

1610s, originally in astrology, from Latin quintus “the fifth” (see quinque-) + -ile, from quartile. Use in statistics dates to 1951.

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Quintilian
[kwin-til-yuh n, -ee-uh n] /kwɪnˈtɪl yən, -i ən/ noun 1. (Marcus Fabius Quintilianus) a.d. c35–c95, Roman rhetorician. /kwɪnˈtɪljən/ noun 1. Latin name Marcus Fabius Quintilianus. ?35–?96 ad, Roman rhetorician and teacher
Quintillion
[kwin-til-yuh n] /kwɪnˈtɪl yən/ noun, plural quintillions (as after a numeral) quintillion. 1. a cardinal number represented in the U.S. by 1 followed by 18 zeros, and in Great Britain by 1 followed by 30 zeros. adjective 2. amounting to one quintillion in number. /kwɪnˈtɪljən/ noun (pl) -lions, -lion 1. (in Britain, France, and Germany) […]
Quint-major
noun 1. See under 1 (def 2). [kwint, kint] /kwɪnt, kɪnt/ noun 1. an organ stop sounding a fifth higher than the corresponding digitals. 2. Piquet. a sequence of five cards of the same suit, as an ace, king, queen, jack, and ten (quint major) or a king, queen, jack, ten, and nine (quint minor) […]

Quintillionth
[kwin-til-yuh n] /kwɪnˈtɪl yən/ noun, plural quintillions (as after a numeral) quintillion. 1. a cardinal number represented in the U.S. by 1 followed by 18 zeros, and in Great Britain by 1 followed by 30 zeros. adjective 2. amounting to one quintillion in number. /kwɪnˈtɪljən/ noun (pl) -lions, -lion 1. (in Britain, France, and Germany) […]
Quint-minor
noun 1. See under 1 (def 2). [kwint, kint] /kwɪnt, kɪnt/ noun 1. an organ stop sounding a fifth higher than the corresponding digitals. 2. Piquet. a sequence of five cards of the same suit, as an ace, king, queen, jack, and ten (quint major) or a king, queen, jack, ten, and nine (quint minor) […]