noun, plural missionaries. Also, missioner.
a person sent by a church into an area to carry on evangelism or other activities, as educational or hospital work.
a person strongly in favor of a program, set of principles, etc., who attempts to persuade or convert others.
a person who is sent on a mission.
pertaining to or connected with religious missions.
engaged in such a mission, or devoted to work connected with missions.
reflecting or prompted by the desire to persuade or convert others: the missionary efforts of political fanatics.
characteristic of a missionary.

1635–45; < Neo-Latin missiōnārius. See mission, -ary

nonmissionary, adjective, noun, plural nonmissionaries.
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World English Dictionary
missionary (ˈmɪʃənərɪ)
n , pl -aries
1.  a member of a religious mission
2.  of or relating to missionaries: missionary work
3.  resulting from a desire to convert people to one's own beliefs: missionary zeal

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1656, from mission (q.v.). Missionary position first attested 1969; allegedly so called because Christian missionaries forced it on "primitive" people to replace their more creative variations.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If there's a missionary picture of us, too, there are a lot of people with
  negative views of missionaries.
For a time modernization suited hula little better than the missionaries had.
The former was a great protector and benefactor to these missionaries, nor did
  the latter oppose their preaching.
The missionaries whom he had dispersed before his departure, had spread the
  gospel on every side.
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