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Webster 1913 Edition

Noun.

One who compromises.

Noun.

One who compromises.

compromiser ‎(plural compromisers)

One who compromises; especially, one who compromises readily
- 2009, January 2, Is Ken Salazar Too Nice?:
  The word on Ken Salazar, tapped by President-elect Barack Obama to run the Interior Department, is that he is friendly, approachable, a good listener, a genial compromiser and a skillful broker of deals.