[f. CONDITION v. + -ER.]
† 1. One that makes conditions, a bargainer. Obs.
1598. Florio, Patteggiatore, a bargainer, a covenanter, a conditioner, a promiser.
2. An agent that brings into good condition.
1888. Advt., in Amer. Farmer (Chicago), Dec. Charcoal Powders A splendid conditioner and medicine.