Lexical Definition

‎τετράρχης‎ tetrárchēs (tet-rar'-khace) tetrarch ^G:N-M
from ‎τέσσαρες‎ and ‎ἄρχω‎

tetrarch.

• the ruler of a fourth part of a country ("tetrarch")

Abbott-Smith

† τετραάρχης (Rec. τετράρχης, v. supr.), -ου, ὁ (< τετρα- in comp. = τέτορα, Doric for τέσσαρα, + ἄρχω),
a tetrarch, i.e.
(a) prop., the governor of a fourth part of a region (Strab.);
(b) any petty ruler (Plut.); in NT, of Herod Antipas: Mt 14:1, Lk 3:19 9:7, Ac 13:1.†

Abbott-Smith References

Liddell-Scott-Jones

τετράρχης-ης, ου, ὁ,

tetrarch, [Refs 1st c.BC+], etc.; of rulers under the protection of Rome of lower grade than kings, e.g. in Palestine, [NT+1st c.AD+]: also τέτραρχος, Θεσσαλῶν [Refs 4th c.BC+] genitive -χου [Refs] c.AD), but -χα [Refs]

__II a leader of four λόχοι, or 64 men, [Refs 3rd c.BC+]

_{LSJ Scripture Refs: Matt.14.1}