(grammar) Noun case used to express some relationship such as possession or origin. It corresponds roughly to the English preposition “of” and the suffix “-'s”.

(grammar) Case used to express direction towards an indirect object, the recipient or beneficiary of an action, and is generally indicated in English by to (when a recipient) or for (when a beneficiary) with the objective case. The direct object may be either stated or unstated where the indirect object is the beneficiary of the verbal action, but is stated where the indirect object is a recipient. If there is emphasis on the indirect object, the indirect object usually precedes the direct object and is not usually indicated with to or for; said structure is also used when neither object is being emphasized.

(grammar) The case used to indicate the subject—or agent—of a finite verb. / (obsolete, grammar) The subject of a verb.

(computer science) Making a distinction between upper-case and lower-case letters.

(computer science) Treating or interpreting upper- and lowercase letters as being the same.

The capital letters A, B, C, ... as opposed to the small letters a, b, c, ....

The minuscule or small letters (a, b, c, as opposed to the uppercase or capital letters, A, B, C).

(computer science) 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.

(slang, potentially offensive) One made powerless or ineffective, as by nerves, panic, stress or exhaustion.

(grammar) Any noun case except the nominative case (and sometimes the vocative case), where the noun is the object of a verb or the object of a preposition.