earth·ling (ûrth?l?ng)n.1. One, especially a human, that inhabits the planet Earth.2. A person devoted to the world; a worldling.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.earthling (????l??) n(esp in poetry or science fiction) an inhabitant of the earth; human being[C16: from earth + ling1]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014earth?ling (??r? l??) n. 1. an inhabitant of earth; mortal. 2. worldling. [1585?95] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.