- 1[usually passive] to train somebody/something to behave in a particular way or to become used to a particular situation condition somebody/something (to something) the difference between inborn and conditioned reflexes (= reactions that are learned/not natural) Patients can become conditioned to particular forms of treatment. condition somebody/something to do something The rats had been conditioned to ring a bell when they wanted food.
- 2condition somebody/something to have an important effect on somebody/something; to influence the way that something happens Gender roles are often conditioned by cultural factors. National choices are conditioned by the international political economy.
- 3condition something to keep something such as your hair or skin healthy a shampoo that cleans and conditions hair a polish for conditioning leather See related entries: Styling hair Word Origin Middle English: from Old French condicion (noun), condicionner (verb), from Latin condicio(n-)
BrE BrE//kənˈdɪʃn//; NAmE NAmE//kənˈdɪʃn//Verb Forms present simple I / you / we / they condition
BrE BrE//kənˈdɪʃn//; NAmE NAmE//kənˈdɪʃn//he / she / it conditions
BrE BrE//kənˈdɪʃnz//; NAmE NAmE//kənˈdɪʃnz//past simple conditioned
BrE BrE//kənˈdɪʃnd//; NAmE NAmE//kənˈdɪʃnd//past participle conditioned
BrE BrE//kənˈdɪʃnd//; NAmE NAmE//kənˈdɪʃnd//-ing form conditioning
BrE BrE//kənˈdɪʃnɪŋ//; NAmE NAmE//kənˈdɪʃnɪŋ//Styling hair