A unit of time equal to 1000 years, commonly used in archaeology, paleontology, climatology, and related sciences. Of course, a kiloyear is the same as a millennium
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}