The term “mission” comes from the Latin word “missio” which means “sending off”, “sending away”. The word “mission” in its modern sense apparently goes back to St. Ignatius of Loyola in the 16th century. By the fourth “vow of the mission”, certain Jesuits were sent to non‐Christian lands (or to countries lost to Catholicism during the Protestant Reformation) as agents vested with the authority of the pope to propagate the Catholic faith. Those sent soon came to be called “missionaries” and the places they were sent, “missions”. The task of the missionaries is itself called “mission”. “Evangelization” on the other hand comes from the Greek word εὐαγγέλιον “euanggelion” (εὔ = “good”, ἀγγέλλω = “I bring a message”; the word “angel” [messenger] is of the same root). It originally meant a reward for good news given to the messenger and later “good news”, thus, “Gospel” from “good” and “spell” meaning “words” or “speech”. In its precise sense, evangelization is the mission directed to those who do not know Christ. In a wider sense, it is used to describe ordinary pastoral work, while the phrase “new evangelization” designates pastoral outreach to those who no longer practice the Christian faith.
From A CATECHETICAL PRIMER ON THE LIFE, MARTYRDOM AND GLORIFICATION OF BLESSED PEDRO CALUNGSOD by Msgr. Ildebrando Jesus Aliño Leyson