Quick Definition
διότι Cj. on this account, because, for
Strong's Definition
on the very account that, or inasmuch as
Derivation: from G1223 (διά) and G3754 (ὅτι);
KJV Usage: because (that), for, therefore
UBS Dictionary of the Greek New Testament
conj. | διά τοῦτο + ὅτι
89.26 · Relations · Cause and/or Reason
because of, on account of, by reason of marker of cause or reason, with focus upon instrumentality, either of objects or events
LUK 1:13 · LUK 2:7 · LUK 21:28 · ACT 13:35 · ACT 18:10 · ACT 18:10 · ACT 20:26 · ACT 22:18 · ROM 1:19 · ROM 1:21 · ROM 3:20 · ROM 8:7 · 1CO 15:9 · PHP 2:26 · 1TH 2:8 · 1TH 2:18 · 1TH 4:6 · HEB 11:5 · HEB 11:23 · JAS 4:3 · 1PE 1:16 · 1PE 1:24 · 1PE 2:6
90.21 · Case · Content
that, the fact that a marker of discourse content, whether direct or indirect The marking of direct and indirect discourse varies greatly from language to language. In some instances there is no marker at all; in other cases one marker precedes and another follows. In still other instances a repetition of an expression of speaking occurs at the end of a quotation, whether direct or indirect. In a number of languages written usage differs appreciably from spoken usage, because intonation so often marks introduced discourse in the spoken form of a language.
In ROM 8:21 διότι appears to be simply a variant of ὅτι[a], 89.26)
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
δι-ότι, conjunction, equiv. to διὰ τοῦτο, ὅτι; 1. on this account that, because, [ef. W. 445 (415}7: Lk. ii. 7; xxi. 28; Acts [xiii. 35, where RG διό]; xvii. 31 Ree.; xx. 26 TWH Trmrg.; xxii. 18; 1 Co. xv. 9; Gal. ii. 16 (LT Tr WH ore); Phil. 11. 26; 1 Th. ii. 8; iv. 6; Heb. xi. 5, 23; Jas. iv. 3; 1 Pet. i. 16, 24; ii. 6 [Rec. διὸ καί]. 2. for (cf. Fritzsche on Ro. i. 19, vol. i. p. 57 sq.; [per contra Mey. ad loc.; Ellic. on Gal. ii. 16; (ef. Jebb in Vincent and Dickson, Modern Greek ete. ed. 2, App. § 80, 3)]): Lk. i. 13; Acts x. 20 Ree. ; xviii. 10; Ro. i. 19, 21; iii. 20; viii. 7; (1 Th. ii. 18 L T Tr WH for RG διό); [1 Pet. i. 16 Tdf. From Hdt. down.]
Mounce Concise Greek Dictionary
διότι dioti 23x
on the account that, because, Lk. 2:7; 21:28; in as much as, Lk. 1:13; Acts 18:10
Abbott-Smith Greek Lexicon
δι-ότι , conjunct., for διὰ τοῦτο, ὅτι (Lat. propterea quod), because: Lk 1:13 2:7 21:28, Ac 13:35 18:10 20:26 22:18, Ro 1:19, 21 3:20 8:7, 21, I Co 15:9, Phl 2:26, I Th 2:8, 18 (Lft., Notes, 37) 4:6, He 11:5, 23, Ja 4:3, I Pe 1:16, 24 2:6. It is usually stronger than ὅτι, but sometimes, as in Lk 1:13, Ro 1:19, I Th 2:18, approximates to MGr. sense, for; cf. Milligan, Th., l.c.†
Moulton & Milligan — Vocabulary of the Greek NT
διότι. For διότι with its full causal force, see P Tebt I. 2453 (B.C. 117) καὶ διότι δι ἄλλων προσανενηνόχαμεν, “ἡ to my giving information through the officials ’’ (Edd.), P Giss I. 82% (A.D. 117), P Lond 243" (c. A.D. 346) (= IL. p. 300) ἵνα. . . ἀπολύσῃς αὐτοὺς διότι οἶδας καὶ αὐτὸς ὅτ]ι ἑωρτή ἐστι(ν), etc. In the papyri, however, as in the LXX and late Grk generally, the word is often practically = ὅτι, ‘‘that,’’ e.g. P Petr IL. 4(9)8 (B.c. 255-4) οἶδας δὲ διότι [ὁ] τόπος ἐρῆμός ἐστιν, P Vebt 1. 127° (8.6, owing used. | 118) ἐπὶ οὐ καὶ σὺ οὐκ ἀγνοεῖς ἐν ἣι ἐσμὲν ἀσχολί (/. -ίαι» | καὶ διότι ἐν τῆι τίο]ῦ στρα(τηγοῦ) ἐσμὲν φίυλακῆι 9), ‘* for you know how busy I am, and that I am in attendance upon the strategus’’ (Edd.), and from the inserr. OG/S 90°= (Rosetta Stone—B.C. 196) ὅπως γνώριμον ἧι διότι οἱ ἐν | Αἰγύπτωι αὔξουσι καὶ τιμῶσι τὸν θεὸν ᾿Εἰπιφανῆ Εἰὐὐχάριστον | βασιλέα, Sy// 654 {εν (Ὁ ii/B.c..—in Messenian Doric). For | the corresponding NT usage, see Blass Gr. p. 274, where
Liddell-Scott-Jones — Greek-English Lexicon
διότι (dioti) — because. διότι, conjunction for διὰ τοῦτο ὅτι.. [Refs 2nd c.AD+], because, for the reason that, since, [Refs 5th c.BC+]; οὐδὲ δι᾽ ἓν ἄλλο ἢ διότι.. [Refs 5th c.BC+]
2. indirect, wherefore, for what reason, φράσω διότι.. [Refs 5th c.BC+]; σκοπεῖν διότι.. [Refs 5th c.BC+]; ἐρωτᾶν διότι.. [Refs 4th c.AD+]
II. ={ὅτι}, that, [Refs 5th c.BC+]: followed by infinitive, [Refs 2nd c.BC+]