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TeachMeFinance.com - explain period period The term 'period' as it applies to the area of Earth observation can be defined as ' Time required for a satellite to make one complete orbit. A division of geologic time, delimited by full-scale withdrawal of the sea from land masses and by limited crustal, climatic, and volcanic upheaval in a localized area. Two or more periods are required to make up a geologic era, and each period is comprised of two or more geologic epochs. '. Previous 5 Terms: perigean tides Perigee perigee (aka periapsis or perifocus) perihelion perimeter Next 5 Terms: period period decay (aka decay) periodic current Periodic Facility Review (PFR) periodic function About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.