δι-ότι , conjunct. for διὰ τοῦτο, ὅτι (Lat. propterea quod),

because: Luk.1:13 2:7 21:28, Act.13:35 18:10 20:26 22:18, Rom.1:19, 21 3:20 8:7, 21, 1Co.15:9, Php.2:26, 1Th.2:8, 18 (Lft. Notes, 37) 1Th.4:6, Heb.11:5, 23, Jas.4:3, 1Pe.1:16 1:24 2:6. It is usually stronger than ὅτι, but sometimes, as in Luk.1:13, Rom.1:19, 1Th.2:18, approximates to MGr. sense, for; cf. Milligan, Th. l.with†

(AS)

because; for