different between periodicity vs infradian

English

From French périodicité.

Morphologically periodic +? -ity

periodicity (countable and uncountable, plural periodicities)

Recurrence of a woman's periods; menstruation.
The quality of being periodic; tendency to recur at regular intervals.
(mathematics) The quality of a function with a repeated set of values at regular intervals.

infradian (not comparable)

Cyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian.

The comparative "more infradian" is not used, in contrast to the comparative "more ultradian".

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