We found 10 dictionaries that define the word diurnal variation:

General (7 matching dictionaries)

1. diurnal variation: Vocabulary.com
2. diurnal variation: Dictionary.com
3. Diurnal Variation, Diurnal variation: Wikipedia, the Free Encyclopedia
4. diurnal variation: Rhymezone
5. diurnal variation: FreeDictionary.org
6. diurnal variation: Mnemonic Dictionary
7. diurnal variation: TheFreeDictionary.com

Computing (1 matching dictionary)

8. diurnal variation: Encyclopedia

Medicine (1 matching dictionary)

9. diurnal variation: Medical dictionary

Tech (1 matching dictionary)

10. Schlumberger Oilfield Glossary (No longer online)

(Note: See diurnal_variations as well.)

Definitions from WordNet (diurnal variation) ▸ noun:  fluctuations that occur during each day Phrases: Diurnal air temperature variation, more... ▸ Words similar to diurnal variation ▸ Usage examples for diurnal variation ▸ Idioms related to diurnal variation ▸ Wikipedia articles (New!) ▸ Words that often appear near diurnal variation ▸ Rhymes of diurnal variation ▸ Invented words related to diurnal variation