/keuhn dish"euh neuhr/ , n.
1. a person or thing that conditions.
2. something added to a substance to increase its usability, as a water softener.
3. a cream or liquid preparation applied to the hair or skin, esp. for its emollient qualities.
4. a trainer of athletes.
5. an air conditioner.
6. Textiles. a person who conditions fibers or fabrics.
[ 1590-1600; CONDITION + -ER 1 ]