Lexical Definition

‎αὐθεντέω‎ authentéō (ow-then-teh'-o) to domineer ^G:V
from a compound of ‎αὐτός‎ and an obsolete (a worker)

usurp authority over.

• to act of oneself, i.e. (figuratively) dominate

Abbott-Smith

*† αὐθεντέω, -ῶ (< αὐθέντης, i.e. αὐτο- ἕντης, one who acts on his own authority, in π., an autocrat; cf. Wi 12:6; cf. -ία, III Mac 2:29; -ικος is freq. in vernacular, MM, s.v.),
to govern, exercise authority over: I Ti 2:12.†

Abbott-Smith References

Liddell-Scott-Jones

αὐθεντέω-έω,

to have full power or authority over, τινός I [NT+1st c.BC+]: with infinitive, [Refs 6th c.AD+]

__2 commit a murder, [Refs 4th c.BC+]

_{LSJ Scripture Refs: Titus.2.12}