[τετράδιον] neuter of a presumed derivative of τέτρας (a tetrad; from G5064); a quaternion or squad (picket) of four Roman soldiers
Usages throughout the bible
Acts 12:4
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And when he had apprehended him, he put him in prison, and delivered him to four quaternions G5069 of soldiers to keep him; intending after Easter to bring him forth to the people.
