Quick Definition
λεγεών, ῶνος, ἡ n.f. & n.m. a legion, very large number
Strong's Definition
of Latin origin; a "legion", i.e. Roman regiment (figuratively)
KJV Usage: legion
UBS Dictionary of the Greek New Testament
noun, f. | -ῶνος
55.8 · Military Activities · Army
legion, army a Roman army unit of about six thousand soldiers The expression ‘twelve legions of angels’ indicates a very large group of angels; accordingly, the meaning may be rendered as ‘many, many angels’ or ‘thousands of angels.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Mounce Concise Greek Dictionary
λεγιών legiōn 4x
also spelled λεγεών, a Roman legion; in NT used indefinitely for a great number, Mt. 26:53; Mk. 5:9, 15, Lk. 8:30*
Abbott-Smith Greek Lexicon
*† λεγιών (Rec. -εών), -ῶνος, ἡ, (Lat. legio), a legion: Mt 26:53, Mk 5:9, 15, Lk 8:30.†
Moulton & Milligan — Vocabulary of the Greek NT
λεγιών. The spelling λεγιών, which is always found in the NT occurrences of this Latin word (Mt 26%, Mk 5915, Lk 839), is supported by numerous exx. in the papyri, e.g. P Lond 256 recto (a)® (A.D. 15) (Ξ-Ξ 11. p. 99) λεγιῶνος δευτέρας κἰκοστῆς (= καὶ εἰκοστῆς), BGU I. 1407 (time of Hadrian) Aeyt@vo(s) [B], 73. 156! (A.D. 201) Διογένης στρατιώτης λεγιῶνος B, P Oxy XIV. τ6665 (iii/A.D.) γεγραφηκὼς περὶ τοῦ petkpod Παυσανίου ὡς εἰς λεγιῶνα στρατευσάμενον, ‘‘having written you about the little Pausanias becoming a soldier ” (Edd.), and BGU III. 8991 (iv/a.D. ἢ) στρατιώτης λεγιόνω[ς] (2. λεγιῶνος) πέμπτης Μακαιδωνικῆς (ἡ. Μακεδονικῆς) : cf. also 20. I. 113} (Α.Ὁ. 143) A]syetl@vos. The spelling λεγεών is also found—BGU IV. 1108? (B.C. 5) NelyeGv[o]s, P Oxy II. 276° (A.D. 77) Aeye@vos δευτέρας, BGU I. εἴ: 13} (4.p, 340) ὑπὸ τοῦ πραιποσίτου τῆς λεγεῶνος τῷ στρατιώτῃ τῆς λεγεῶνος, etc. See further Moulton Gr. ii. p. 76. λέγω 3
Liddell-Scott-Jones — Greek-English Lexicon
λεγεών (legeōn) — Legion. λεγεών, ῶνος, ἡ, = Latin legio, [NT+1st c.AD+]:—frequently written λεγιών, [Refs]: —hence λεγιονάριος, ὁ, [Refs]