diurnal variation

1. 1.

   fluctuations that occur during each day

   Broadervariation

Questions about diurnal variation

What does diurnal variation mean?

diurnal variation means "fluctuations that occur during each day".

Is diurnal variation a common word?

diurnal variation is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.