Pentad
Chamber's Twientieth Century Dictionary · 1908 · p. 75
pen′tad, n. the number five, a group of five things: a mean of temperature, ., taken every five days.
Bu kavram başka kaynaklarda da geçiyor
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
An Illustrated Encyclopedic Medical Dictionary (1894)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
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