—n.Also,mis'sion•er. 1. a person sent by a church into an area to carry on evangelism or other activities, as educational or hospital work.
2. a person strongly in favor of a program, set of principles, etc., who attempts to persuade or convert others.
3. a person who is sent on a mission.
—adj. 1. pertaining to or connected with religious missions.
2. engaged in such a mission, or devoted to work connected with missions.
3. reflecting or prompted by the desire to persuade or convert others: the missionary efforts of political fanatics. 4. characteristic of a missionary.