/ Dictionary / Index C conditioner: Meaning and Definition of Find definitions for: con•di•tion•er Pronunciation: (kun-dish'u-nur), [key] — n. a person or thing that conditions. something added to a substance to increase its usability, as a water softener. a cream or liquid preparation applied to the hair or skin, esp. for its emollient qualities. a trainer of athletes. an air conditioner. a person who conditions fibers or fabrics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: conditioner (Thesaurus) conditioned response conditioning Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language