metic (n.)

"resident alien in an ancient Greek state," 1808, from Late Latin metycus, from Greek metoikos, literally "one who has changed his residence," from meta "change" (see meta-) + oikos "dwelling," from oikein "to dwell" (from PIE root *weik- (1) "clan"). Generally they bore the burdens of a citizen and had some of a citizen's privileges.