G1658 ἐλεύθερος (eleútheros)

KJV renderings: free (man, woman), at liberty
Strong's definition: unrestrained (to go at pleasure), i.e. (as a citizen) not a slave (whether freeborn or manumitted), or (genitive case) exempt (from obligation or liability)
Derivation: probably from the alternate of G2064 (ἔρχομαι);

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