the century - fighting unit

[Hibernicus]

I believe, if memory serves, (and someone with far better resources than I is going to have to dig deeper into this) .... I believe that centuria come in part from the word centuriationes which are land divisions... related to the word centuriatum

Basically a "century" of men was a group of men from a particular area.

I think the origin comes from dividing land into units of 100.

At some point that group of soldiers was regulated to be a certain size (in our case 80)

Centuria dosn't properly translate as 100.. it better translates as "group"