Quick Definition
τετράδιον, ου, τό n.n. a group of four soldiers
Strong's Definition
neuter of a presumed derivative of tetras (a tetrad; from 5064); a quaternion or squad (picket) of four Roman soldiers
KJV Usage: quaternion
UBS Dictionary of the Greek New Testament
noun, n. | -ου | τέσσαρες
55.11 · Military Activities · Army
squad, group of four soldiers a detachment of four soldiers
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
τετράδιον, -ov, τό, (τετράς, the number four), a quaternion (τὸ ἐκ τεσσάρων συνεστός, Suid.) : τῶν στρατιωτῶν, a guard consisting of four soldiers (for among the Romans this was the usual number of the guard to which the custody of captives and prisons was intrusted ; two soldiers were confined with the prisoner and two kept guard outside), Acts xii. 4, where the four quaternions mentioned were on guard one at a time during each of the four watches. (Philo in Flace. § 13 1. 6. ed. Mang. vol. ii. p. 533, 25.)
Mounce Concise Greek Dictionary
τετράδιον tetradion 1x
a set of four; a detachment of four men, Acts 12:4*
Abbott-Smith Greek Lexicon
† τετράδιον, ου, τό a quarternion, a group of four: στρατιωτῶν, Ac 12:4 (Philo).
Moulton & Milligan — Vocabulary of the Greek NT
τετράδιον, “ἐᾷ group of four,” applied to soldiers in Ac 124, has reference to days in the heathen amulet BGU III. 956 (c ii/A.D.) ἐξορκίζω ὑμᾶς. . ἀπὸ walv]Tos . . πυρετοῦ... ἡμερι-- νοῦΞ- ἢ Tetp[a}B<i>o<vu>, and to sheets of parchment in P Oxy XVII. 21561° (iv/v A.D.) τὴν διφθέραν [τ]ῶν pepBpavav ἐν τετραδίοις εἰκ[οσ]ιπέντε, ‘the skin of parchments in twenty-five quaternions ”’ (Ed.).
Liddell-Scott-Jones — Greek-English Lexicon
τετράδιον (tetradion) — squad of four. τετρᾰδ-ιον, τό, a guard of soldiers (normally consisting of four men), [NT+1st c.AD+]
II. quaternion of parchment, [Refs 4th c.AD+]; compare τετράδειον.