Emily Dickinson Lexicon

ME-TON'IC-CY-CLE, or ME-TON'IC-YEAR, n. [ME-TON'IC CY-CLE, or ME-TON'IC YEAR.]

The cycle of the moon, or period of nineteen years, in which the lunations of the moon return to the same days of the month; so called from its discoverer Meton the Athenian. Encyc. Bailey.