from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The average period of revolution of the moon around the earth in reference to a fixed star, equal to 27 days, 7 hours, 43 minutes in units of mean solar time.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. period between successive conjunctions with a star, 27.322 days
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