G1401 δοῦλος (doûlos)

KJV renderings: bond(-man), servant
Strong's definition: a slave (literal or figurative, involuntary or voluntary; frequently, therefore in a qualified sense of subjection or subserviency)
Derivation: from G1210 (δέω);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.