Definition of ageism noun from the Oxford Advanced American Dictionary

 

ageism

 noun
(also agism)noun
NAmE//ˈeɪdʒɪzəm//
 
[uncountable]
 
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unfair treatment of people because they are considered too old ageism in job advertisements
ageist(also agist)
 
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NAmE//ˈeɪdʒɪst//
 
adjective ageist and sexist remarks ageist attitudes about life after 40
ageist(also agist)noun
 
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See the Oxford Advanced Learner's Dictionary entry: ageism