Borrowed from Japanese 先生(せんせい) (sensei, “teacher; elder”), from Middle Chinese 先生 (MC sen sraeng, “master, elder”), from 先 (MC sen, “earlier, first”) + 生 (MC sraeng, “born”). Compare modern Mandarin 先生 (xiānshēng, “Mr.”). Doublet of sinseh, from Hokkien 先生 (sin-seⁿ).