1540s, "tending to make peace," from Middle French pacifique, from Latin pacificus "peaceful, peace-making," from pax (genitive pacis) "peace" (see peace) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Meaning "peaceful, calm" is first recorded 1630s. Related: Pacifical (mid-15c.); pacifically.
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