slavery
n.
1550s, "severe toil, hard work, drudgery;" from slave, v. + -ery. Meaning "state of servitude" is from 1570s; meaning "keeping or holding of slaves" is from 1728.
〔李〕[slav（ ←slave）n. 奴隶；-ery ⇒“the condition of a slave奴隶的状态”→] n. ①the condition or fact of being a slave奴隶身份