A yahren is a Colonial measurement of time.
Analagous to an Earth year; plural form is same as singular, "yahren".
Note[edit]
Within some fan circles, a yahren is considered to be around two-thirds (2/3) the length of an Earth year, thus helping to explain the relative longevity of Colonial people compared to Terran humans.
In the reimagined series the colonials say year instead, although a brief mention of the term appears in the documents visible at Armistice Station.
See also: Thousand Yahren War
See also: Units of Measure (TOS)