Crossword Genius

Period of revolution (4)

Ross

I believe the answer is:

turn

This clue is a double definition.

'period' is the first definition.
(turn is a kind of period)

'revolution' is the second definition.
(revolution can mean a turn or rotation)

'of' is the link.

(Other definitions for turn that I've seen before include "Move in a new direction" , "revolutionary act" , "Sour" , "Move around an axis, or change" , "roll" .)

I've seen this clue in The Globe and Mail.
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