n.
Pronunciation: s ə r- ˌ k ə m-v ə - ' lü-sh ə n, ˌ s ə r-k ə m-v ō -
Function: noun
Etymology: Middle English circumvolucioun, from Medieval Latin circumvolution-, circumvolutio, from Latin circumvolvere to revolve, from circum- + volvere to roll ― more at VOLUBLE
Date: 15th century
: an act or instance of turning around an axis