Lewis Short
servĭtūdo (noun F) : servus
* Slavery, servitude (perh. only in the foll. passages): servitudinis homines expertos,Liv. 24, 22, 2 Drak. N. cr. dub. (Weissenb. servitutis): eritudo servitudo, Paul. ex Fest. p. 83 Müll.: servitudo, δουλεία, Gloss. Philox.
Charlton T. Lewis, Charles Short, A Latin Dictionary