"self-cremation of a Hindu widow on her husband's funeral pyre," 1786, from Hindi, from Skt.
sati "virtuous woman," fem. of
sat "good, wise," lit. "existing," prp. of
asmi "I am" (cognate with L.
esse; see
essence). Properly, the word for the woman who does so. The custom was abolished in British India in 1829.