Firm, true.

The word is used to denote acceptance (Deut. 27: 15-26) or truthfulness (1 Kgs. 1: 36). Amen was the proper response of a person to whom an oath was administered (1 Chr. 16: 36; Neh. 5: 13; Neh. 8: 6). Christ is called “the Amen, the faithful and true witness” (cf. John 14: 6; 1 Cor. 14: 16; 2 Cor. 1: 20; Rev. 3: 14).