case-sensitive

adjective
case-sen·​si·​tive | \ˈkās-ˈsen(t)-sə-tiv, -ˈsen(t)s-təv\

Definition of case-sensitive 

: requiring correct input of uppercase and lowercase letters Having the Caps Lock key on accidentally can also lead to a frustrating series of "wrong password" alerts when trying to use a case-sensitive password for your office network or Internet provider.— J. D. Biersdorfer

First Known Use of case-sensitive

1981, in the meaning defined above

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The first known use of case-sensitive was in 1981

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