Upper case or uppercase?
upper case is a noun meaning “The capital letters A, B, C, ... as opposed to the small letters a, b, c, ..”; uppercase is an adjective meaning “Written in upper case; capital”. Use upper case as a noun and uppercase as an adjective. upper case is written as two words and uppercase as one word; they are used differently.
What is the difference between upper case and uppercase?
| upper case | uppercase | |
|---|---|---|
| Part of speech | noun, adjective | adjective, noun, verb |
| Meaning | The capital letters A, B, C, ... as opposed to the small letters a, b, c, ... | Written in upper case; capital To convert (text) to upper case |
| Example | none recorded | none recorded |
| Pronunciation | not recorded | not recorded |
| In writing | not counted (the list counts single words) | about once in every 3 million words |
Sources: upper case and uppercase in the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Every current meaning of upper case and uppercase
upper case
- 1
The capital letters A, B, C, ... as opposed to the small letters a, b, c, ...
- 2
Alternative spelling of uppercase
uppercase
- 1
Written in upper case; capital
- 2
Alternative form of upper case
- 3
To convert (text) to upper case
Source: the English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0); obsolete, archaic, dialect and rare senses left out.
Which is more common, upper case or uppercase?
upper case is a phrase, which the list of single words does not count; uppercase about once in every 3 million words.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).