uppercase

US: /ˈʌpɚˈkeɪs/

WordReference Random House Learner's Dictionary of American English © 2025

up•per•case /ˈʌpɚˈkeɪs/   adj., 

1. (of an alphabetical character) capital:
   uppercase characters like A, B, and C.

n. [uncountable]

2. capital letters when they are thought of as a group. Compare lowercase.

WordReference Random House Unabridged Dictionary of American English © 2025

up′per case′, [Print.]

1. Printing See under case ² (def. 8).

• 1675–85

up•per•case  (up′ər kās′), adj., v., -cased, -cas•ing, n. 
adj. 

1. (of an alphabetical character) capital.
2. [Print.] pertaining to or belonging in the upper case.

v.t. 

3. to print or write with an uppercase letter.

n. 

4. a capital letter. Cf. lowercase. 

• upper¹ + case² 1730–40

Collins Concise English Dictionary © HarperCollins Publishers::

upper case noun

1. the top half of a compositor's type case in which capital letters, reference marks, and accents are kept

adjective (upper-case when prenominal)

1. of or relating to capital letters used in the setting or production of printed or typed matter

Abbreviation: uc