case-sensitive

/K EY1 S EH0 N S AH0 T IH0 V/
adjective
  1. 1

    Distinguishing upper- and lower-case letters. Often used in computer science to indicate a distinction is made in comparison or equality of letters based on case. For example, a case-sensitive password will not recognize "Password" and "password" as the same, but a case insensitive comparison would.

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Source: https://en.wiktionary.org/wiki/case%20sensitive, https://en.wiktionary.org/wiki/case-sensitive