1910 New Catholic Dictionary
One of the vigils or four ancient divisions of the night, during which public or official prayer was offered in the earliest days of the Church. The Matins and Lauds of the Divine Office most probably represent these watches.
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Entry for 'Night Watch'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/n/night-watch.html. 1910.