septa, septage, septal, septaria, septarian, septarium, septate, septation, septavalent, septcentenary, septenaries, septennia, septennial, septenium, septet, septic, septicemia, septivity, septillion, septimal, septimes, septivslent, septoria, septs, septuagenarian, septum, septuple, septuplet
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sept- sept-
Some words with the prefix 'sep' are septic, September, and septuagenarian. Some words with the prefix 'hep' are hepatitis, heptathlon, and heptathlete.
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The prefixes sept(a)- and hept(a)- may both be used for seven. The month of September was originally the seventh in the Roman calendar.
It probably is 'septennial' because sept means 7 and ennial means year