STEP Greek Lexicon: μαρὰν ἀθά

μαρὰν ἀθά (Rec. μαραναθά; Aram.: on the original form see Dalman, Gr., § 41, 1; 74, 3; Words, 328),

Maranatha, i.e. the Lord cometh (but see Dalman, ll. with; Field, Notes, 180; ICC, in l): 1Co.16:22.†

(AS)