Definition of conventional adjective from the Oxford Advanced Learner's Dictionary

        

    conventional

     adjective
    adjective
    BrE BrE//kənˈvenʃənl//
     
    ; NAmE NAmE//kənˈvenʃənl//
     
    Conventional medicine
     
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  1. 1  (often disapproving) tending to follow what is done or considered acceptable by society in general; normal and ordinary, and perhaps not very interesting conventional behaviour/morality She's very conventional in her views. opposite unconventional
  2. 2  [usually before noun] following what is traditional or the way something has been done for a long time conventional methods/approaches conventional medicine It's not a hotel, in the conventional sense, but rather a whole village turned into a hotel. You can use a microwave or cook it in a conventional oven. opposite unconventional See related entries: Conventional medicine
  3. 3[usually before noun] (especially of weapons) not nuclear conventional forces/weapons A conventional war would still cause unacceptable devastation. a conventional power station (= using oil or coal as fuel, rather than nuclear power)
  4. Word Origin late 15th cent. (in the sense ‘relating to a formal agreement or convention’): from French conventionnel or late Latin conventionalis, from Latin conventio(n-) ‘meeting, covenant’, from the verb convenire ‘assemble, agree, fit’, from con- ‘together’ + venire ‘come’.Extra examples He turned out to be a very conventional young man. Her face is not beautiful in conventional terms. It’s not a hotel in the conventional sense, rather a whole village turned into a hotel. My sister was taught to read by more conventional methods. Raising such a large amount of money from conventional sources would be difficult. She had a fairly conventional start to her career. The imagery in the poem is somewhat conventional. They rejected what they saw as the hypocrisy of conventional society.
See the Oxford Advanced American Dictionary entry: conventional