We found 27 dictionaries that define the word half step:

General (19 matching dictionaries)

1. half step: Merriam-Webster
2. half step: Oxford Learner's Dictionaries
3. half step: American Heritage Dictionary of the English Language
4. half-step, half-step, half step: Collins English Dictionary
5. half step: Vocabulary.com
6. Half-Step, half-step, half step: Wordnik
7. half step: Cambridge Advanced Learner's Dictionary
8. half-step, half step: Wiktionary
9. half step: The Wordsmyth English Dictionary-Thesaurus
10. half step: Infoplease Dictionary
11. Half step, half step: Dictionary.com
12. Half-step, Half step: Wikipedia, the Free Encyclopedia
13. half step: Rhymezone
14. half step: FreeDictionary.org
15. half step: Mnemonic Dictionary
16. half-step, half step: TheFreeDictionary.com
17. half step: Longman Dictionary of Contemporary English

Art (2 matching dictionaries)

18. Essentials of Music (No longer online)
19. Virginia Tech Multimedia Music Dictionary (No longer online)

Computing (1 matching dictionary)

20. Half-step, half step: Encyclopedia

Science (1 matching dictionary)

21. How Many? A Dictionary of Units of Measurement (No longer online)

Slang (2 matching dictionaries)

22. half step: Green’s Dictionary of Slang
23. half step: Urban Dictionary

Tech (2 matching dictionaries)

24. Rane Professional Audio Reference (No longer online)
25. Sweetwater Music (No longer online)

(Note: See half_steps as well.)

Definitions from Wiktionary (half step) ▸ noun:  (music, US) The distance between two tones. In 12-tone equal temperament, its frequency ratio is 2^(1/12), or about 1.059 or 18/17. Similar: semitone, half-step, whole step, step, minor seventh, quarter tone, major seventh, major second, cycle of fifths, octave, more... Opposite: whole step, full step, tone Phrases: half step pussy ass nigga, half of a half step in music, half of a half step in music, half step in music, more... ▸ Words similar to half step ▸ Usage examples for half step ▸ Idioms related to half step ▸ Wikipedia articles (New!) ▸ Words that often appear near half step ▸ Rhymes of half step ▸ Invented words related to half step