STRONGS G5069:
													
												
									    		τετράδιον, 
τετραδιου, 
τό (
τετράς, the number four), 
a quarternion (
τό ἐκ τεσσάρων συνεστος, 
Suidas): 
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 12:4, where the four quaternions mentioned were on guard one at a time during each of the four watches. (
Philo in Flacc. § 13 i. e. Mang. edition vol. ii, p. 533, 25.) 
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