To go or cause to go out of orbit.(verb-transitive)
The act or process of going out of orbit.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "deorbit" in a sentence
"M. O'BRIEN: We are one minute into that rocket firing they call the deorbit burn, two minutes and 42 seconds worth of rocket firing."
"The second stage of the deorbit was the transfer of the station into a 165 x 220 km (103 x 137 mi) orbit."
"The deorbit burn is beginning as I type this blog post."