1910 New Catholic Dictionary
(1) Motion of reverence by bowing or lifting the hat when meeting a priest, and when passing a church, because it is the House of God and, as a rule, the sanctuary of the Blessed Sacrament. It is common also in the Liturgy, as when at Mass the priest salutes the congregation with "Dominus vobiscum" (The Lord be with you) or "Orate, fratres" (Brethren, pray).
(2) Characteristic opening of the Epistles of the Apostles, wishing those addressed "Grace and the peace of God," and also of the letters of popes and bishops.
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Entry for 'Salutation'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/s/salutation.html. 1910.