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Webster 1913 Edition

Noun.

One who, or that which, occasions, causes, or produces.

Bp. Sanderson.

Noun.

s as z. One that causes or produces, either incidentally or otherwise.

He was the occasioner of loss to his neighbor.

occasioner ‎(plural occasioners)

agent noun of occasion; one who occasions
- 1891, Various, Character Writings of the 17th Century:
  He is an occasioner of disloyal thoughts in the commonwealth, for he makes men hate the king's name worse than the devil's.
- 1901, Jacob Abbott, Charles I:
  The charge recited the evils and calamities which had resulted from the war, and concluded by saying that "the said Charles Stuart is and has been the occasioner, author, and continuer of the said unnatural, cruel, and bloody wars, and is therein guilty of all the treasons, murders, rapines, burnings, spoils, desolations, damages, and mischiefs to this nation acted and committed in the said wars, or occasioned thereby."