Lexical Definition

‎μεσίτης‎ mesítēs (mes-ee'-tace) mediator ^G:N-M
from ‎μέσος‎

mediator.

• a go-between, i.e. (simply) an internunciator, or (by implication) a reconciler (intercessor)

Abbott-Smith

† μεσίτης, -ου, ὁ (< μέσος), [in LXX: Jb 9:33 (בַּיִן)*;]
an arbitrator, mediator: Ga 3:19; c. dupl. gen. pers., θεοῦ κ. ἀνθρώπων, I Ti 2:5; c. gen. rei, διαθήκης, He 8:6 9:15 12:24; ὁ δε μ. ἑνὸς οὐκ ἔστιν, Ga 3:20 (v. Lft., in l.; and for exx. of this word in π., v. MM, xvi).†

Abbott-Smith References

Liddell-Scott-Jones

μεσίτης-ης, ου, ὁ,

mediator, umpire, arbitrator, [NT+3rd c.BC+]; stakeholder, [Refs 3rd c.AD+]

__2 feminine μεσῖτις, ιδος, φιλίας μεσῖτιν τράπεζαν παραθέμενοι [Refs 2nd c.AD+]
__II in a middle position, of a limb, [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Gal.3.19 ☩ 1Tim.2.5}