ἀμήν, Hebrew 
אָמֵן; 
1. verbal adjective (from 
אָמַן to prop; Niph. to be firm), 
firm, metaphorically, 
faithful: 
ὁ ἀμήν, 
Revelation 3:14 (where is added 
ὁ μάρτυς ὁ πιστὸς κ. 
ἀληθινός).
2. it came to be used as an adverb by which something is asserted or confirmed: 
a. at the beginning of a discourse, 
surely, of a truth, truly; so frequent in the discourses of Christ in Matthew, Mark, and Luke: 
ἀμὴν λέγω ὑμῖν 'I solemnly declare unto you,' 
e. g. Matthew 5:18; 
Mark 3:28; 
Luke 4:24. The repetition of the word (
ἀμὴν ἀμήν), employed by John alone in his Gospel (twenty-five times), has the force of a superlative, 
most assuredly: 
John 1:51 (John 1:52); 
John 3:3. 
b. at the close of a sentence; 
so it is, so be it, may it be fulfilled (
γένοιτο, the 
Sept. Numbers 5:22; 
Deuteronomy 27:15, etc.): 
Romans 1:25; 
Romans 9:5; 
Galatians 1:5; 
Ephesians 3:21; 
Philippians 4:20; 
1 Timothy 1:17; 
Hebrews 13:21; 
1 Peter 4:11; 
Revelation 1:6, and often; cf. 
Jeremiah 11:5; 
Jeremiah 35:6 (
Jer. 28:6); 
1 Kings 1:30. It was a custom, which passed over from the synagogues into the Christian assemblies, that when he who had read or discoursed had offered up a solemn prayer to God, the others in attendance responded 
Amen, and thus made the substance of what was uttered their own: 
1 Corinthians 14:16 (
τὸ ἀμήν, the well-known response 
Amen), cf. 
Numbers 5:22; 
Deuteronomy 27:15ff; 
Nehemiah 5:13; 
Nehemiah 8:6. 
2 Corinthians 1:20 αἱ ἐπαγγελίαι... 
τὸ ναί, 
καὶ... 
τὸ ἀμήν, 
i. e. had shown themselves most sure. [Cf. 
B. D. under the word Amen.] 
    THAYER’S GREEK LEXICON, Electronic Database.
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    BLB Scripture Index of Thayer's