Bible Dictionaries
Quaternion
Fausset's Bible Dictionary
"A guard of four soldiers", two attached to the prisoner, two outside his cell door. Four quaternions took by turns the guard over Peter for the four night watches (Acts 12:4).
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Bibliography Information
Fausset, Andrew R. Entry for 'Quaternion'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/q/quaternion.html. 1949.