Definition of upper case in English:

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upper case

noun

[mass noun]
Capital letters as opposed to small letters (lower case): the keywords must be in upper case [as modifier]: upper-case letters
More example sentences
  • Often in fine but upper-case print, most preprinted prescription labels include the words.
  • X's and O's were upper-case letters, 4.0 mm high and 2.0 mm wide.
  • She's always liked us to read to her, and she's been practising her upper-case letters and trying to figure out how to spell words for a long time, but reading stuff she didn't already know frustrated her.

Origin

Referring originally to two type cases positioned on an angled stand, the case containing the capital letters being higher and further away from the compositor.

Words that rhyme with upper case

abase, ace, apace, backspace, base, bass, brace, case, chase, dace, efface, embrace, encase, enchase, enlace, face, grace, interlace, interspace, in-your-face, lace, mace, misplace, outface, outpace, pace, place, plaice, race, space, Thrace, trace

For editors and proofreaders

Line breaks: upper case

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