Guglielmo Marconiphotographed c. 1903Mar·co·ni (mär-k??n?), Guglielmo 1874-1937. Italian engineer and inventor who in 1901 transmitted long-wave radio signals across the Atlantic Ocean. He shared the 1909 Nobel Prize in physics.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.Marconi (m???k??n?) n (Biography) Guglielmo (?u????lmo). 1874?1937, Italian physicist, who developed radiotelegraphy and succeeded in transmitting signals across the Atlantic (1901): Nobel prize for physics 1909Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Mar?co?ni (m?r?ko? ni) n. Guglielmo, 1874?1937, Italian physicist and inventor in the field of wireless telegraphy. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.