Lexicon :: Strong's G3144 - martys

μάρτυς (Aeolic μάρτυρ, a form not found in the N. T.; (etymologically one who is mindful, heeds; probably allied with Latinmemor, cf. Vanicek, p. 1201; Curtius, § 466)), μάρτυρός, accusative μάρτυρα, ὁ; plural μάρτυρες, dative plural μάρτυσι; the Sept. for עֵד; (Hesiod, Simonides, Theognis, others); a witness (one who avers, or can aver, what he himself has seen or heard or knows by any other means);
a. in a legal sense: Matthew 18:16; Matthew 26:65; Mark 14:63; Acts 6:13; Acts 7:58; 2 Corinthians 13:1; 1 Timothy 5:19; Hebrews 10:28.
b. in an historical sense: Acts 10:41; 1 Timothy 6:12; (2 Timothy 2:2); one who is a spectator of anything, e. g. of a contest, Hebrews 12:1; with a genitive of the object, Luke 24:48; Acts 1:22; Acts 2:32; Acts 3:15; Acts 5:32 G L T Tr WH; Acts 10:39; Acts 26:16; 1 Peter 5:1; with a genitive of the possessor 'one who testifies for one', Acts 1:8 L T Tr WH; Acts 13:31; with a genitive of the possessor and of the object, Acts 5:32 Rec.; μάρτυρα εἶναι τίνι, to be a witness for one, serve him by testimony, Acts 1:8 R G; Acts 22:15; (Luke 11:48 T Tr WH). He is said to be a witness, to whose attestation appeal is made; hence, the formulas μάρτυς μου ἐστιν ὁ Θεός, Romans 1:9; Philippians 1:8; Θεός μάρτυς, 1 Thessalonians 2:5: μάρτυρα τόν Θεόν ἐπικαλοῦμαι, 2 Corinthians 1:23; ὑμεῖς μάρτυρες καί ὁ Θεός, 1 Thessalonians 2:10; the faithful interpreters of God's counsels are called God's witnesses: Revelation 11:3; Christ is reckoned among them, Revelation 1:5; Revelation 3:14.
c. in an ethical sense those are called μάρτυρες Ἰησοῦ, who after his example have proved the strength and genuineness of their faith in Christ by undergoing a violent death (cf B. D. American edition and Dict. of Chris. Antiq. under the word ): Acts 22:20; Revelation 2:13; Revelation 17:6.

BLB Scripture Index of Thayer's