'Missioner' definitions:

Definition of 'missioner'

From: WordNet
noun
Someone sent on a mission--especially a religious or charitable mission to a foreign country [syn: missionary, missioner]

Definition of 'Missioner'

From: GCIDE
  • Missioner \Mis"sion*er\, n. A missionary; an envoy; one who conducts a mission. See Mission, n., 6. "Like mighty missioner you come." --Dryden. [1913 Webster]