EN- n. 2 definitions
A suffix from AS. -an, formerly used to form the plural of many nouns, as in ashen, eyen, oxen, all obs. except oxen. In some cases, such as children and brethren, it has been added to older plural forms.
EXTREME n.
or tolerable; hence, furthest degree; any undue departure from the mean; -- often in the plural: things at an extreme distance from each other, the most widely different states, etc.; as, extremes of heat and cold, of virtue and vice; extremes meet. His parsimony went to the extreme of meanness. Bancroft.…