Lexical Definition

‎κυριεύω‎ kyrieúō (ko-ree-yoo'-o) to lord over ^G:V
from ‎κύριος‎

have dominion over, lord, be lord of, exercise lordship over.

• to rule

Abbott-Smith

κυριεύω (< κύριος), [in LXX chiefly for משׁל;]
to be lord or master of, to rule (over): c. gen. obj., Lk 22:25, Ro 14:9, II Co 1:24; absol., I Ti 6:15; metaph., ὁ θάνατος, Ro 6:9; ἡ ἁμαρτία, Ro 6:14; ὁ νόμος, Ro 7:1 (cf. κατα-κυριεύω).†

Abbott-Smith References

Liddell-Scott-Jones

κυριεύω-εύω,

to be lord or master of, πάντων [Refs 5th c.BC+], etc.; τῶν γενημάτων [Refs 2nd c.BC+]; τῆς θαλάττης [Refs 2nd c.BC+]; κυριεύειν τὴν γυναῖκα τοῦ ἀνδρός [NT+1st c.BC+]; gain possession of, seize, ζωγρίᾳ τινῶν [Refs 3rd c.BC+]; τοῦ κυριεύοντος τὴν ὅλην οἰκουμένην [Refs]: absolutely, to be dominant, [Refs 3rd c.BC+]:—passive, to be dominated, possessed, ὑπό τινος [Refs 4th c.BC+]

__b Astrology texts, of planets, κ. τοῦ σχήματος [Refs 2nd c.AD+]:—passive, οἱ -όμενοι τόποι [Refs 2nd c.AD+]
__2 to have legal power to do, with infinitive, Legal cited in [Refs 4th c.BC+]
__II ὁ κυριεύων (i.e. λόγος, which is expressed in [Refs 1st c.AD+]

_{LSJ Scripture Refs: Rom.14.9}