We found 23 dictionaries that define the word lower case:

General (18 matching dictionaries)

1. lower case: Longman Dictionary of Contemporary English
2. lower case: Merriam-Webster
3. lower case: Oxford Learner's Dictionaries
4. lower-case, lower-case, lower case: Collins English Dictionary
5. lower-case: Wordnik
6. lower case: Cambridge Advanced Learner's Dictionary
7. lower-case, lower case: Wiktionary
8. lower-case, lower case: The Wordsmyth English Dictionary-Thesaurus
9. Lower-case, lower-case, lower case: Dictionary.com
10. Lower-case, Lower case: Wikipedia, the Free Encyclopedia
11. Lower-case: Online Plain Text English Dictionary
12. lower-case: Webster's Revised Unabridged, 1913 Edition
13. lower case: Rhymezone
14. Lower-case: AllWords.com Multi-Lingual Dictionary
15. lower-case, lower case: FreeDictionary.org
16. lower-case, lower case: TheFreeDictionary.com

Art (2 matching dictionaries)

17. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)
18. Lower Case: Glossary of English Grammar Terms

Computing (2 matching dictionaries)

19. lower case: CCI Computer
20. lower-case, lower CASE: Encyclopedia

Science (1 matching dictionary)

21. lower case: LITTLE EXPLORERS(TM) Picture Dictionary

(Note: See lower_cases as well.)

Definitions from Wiktionary (lower case) ▸ noun:  The minuscule or small letters (a, b, c, as opposed to the uppercase or capital letters, A, B, C). Similar: lower-case letter, small letter, lowercase, minuscule, upper case, small caps, letter case, uppercase, capital letter, small capitals, more... Opposite: uppercase, capital Phrases: lower case letter, more... Adjectives: case, lowercased, boldface, minuscule, superior, sans serif, solid, inferior, uppercase, justified, sans ▸ Words similar to lower case ▸ Usage examples for lower case ▸ Idioms related to lower case ▸ Wikipedia articles (New!) ▸ Words that often appear near lower case ▸ Rhymes of lower case ▸ Invented words related to lower case