noun
one-mon coin
A historical Japanese coin of the lowest denomination, used from the Edo period into the early Meiji era. Often appears in set phrases about having very little money.
See also: 文 (もん)
江戸時代には、一文銭で駄菓子が買えた。
In the Edo period, you could buy cheap sweets with a one-mon coin.
He didn't have a single mon to his name.