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

necessary

adjective
 
/ˈnesəsəri/
 
/ˈnesəseri/
Idioms
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  1. that is needed for a purpose or a reason synonym essential
    • necessary to do something It may be necessary to buy a new one.
    • necessary for somebody to do something It doesn't seem necessary for us to meet.
    • necessary for something Food is necessary for survival.
    • I'll make the necessary arrangements.
    • Radical change was a necessary step for reform.
    • if necessary If necessary, you can contact me at home.
    • when necessary Only use your car when absolutely necessary.
    • where necessary Changes can easily be made where necessary.
    • He has the expertise necessary to make it work.
    • I was determined not to stay in hospital for any longer than was strictly necessary.
    Extra Examples
    • She has the qualities necessary to be a successful teacher.
    • The owner failed to take the steps necessary to ensure the residents' safety.
    • Make any alterations you consider necessary.
    • The cold weather has made it necessary to protect the crops.
    • These measures will be enforced, if necessary, by the army.
    • We are here to give help and support when necessary.
    • You may find it necessary to readjust the wheels from time to time.
    • qualifications which are necessary for work with the under-fives
    Oxford Collocations Dictionaryverbs
    • appear
    • be
    • prove
    adverb
    • really
    • strictly
    • absolutely
    preposition
    • for
    phrases
    • if necessary
    • as necessary
    • when necessary
    See full entry
  2. [only before noun] that must exist or happen and cannot be avoided synonym inevitable
    • This is a necessary consequence of progress.
    • A necessary condition for a steep fall in demand is a widespread collapse in confidence.
    Topics Permission and obligationb2
  3. Word Originlate Middle English: from Latin necessarius, from necesse ‘be needful’.
Idioms
a necessary evil
  1. a thing that is bad or that you do not like but that you must accept for a particular reason
    • The loss of jobs is regarded as a necessary evil in the fight against inflation.
See necessary in the Oxford Advanced American DictionarySee necessary in the Oxford Learner's Dictionary of Academic English

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