Definition of on a mission
- She's on a mission to locate her lost sister.
: the act or an instance of sending
: a ministry commissioned by a religious organization to propagate (see propagate 3b) its faith or carry on humanitarian work
: assignment to or work in a field of missionary enterprise
: to send on or entrust with a mission
: to carry on a religious mission among or in
: of or relating to a style used in the early Spanish missions of the southwestern U.S.
: of, relating to, or having the characteristic of a style of plain heavy usually oak furniture originating in the U.S. in the early part of the 20th century
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