sen n 1: a fractional monetary unit of Japan and Indonesia and Cambodia; equal to one hundredth of a yen or rupiah or riel
Sen \Sen\, n. A Japanese coin, worth about one half of a cent. [1913 Webster]
Sen \Sen\, adv., prep., & conj. [See {Since}.] Since. [Obs.] [1913 Webster]
SEN. This is said to be an ancient word which signified justice. Co. Litt. 61 a.