se·gno (s??ny?)n. pl. se·gnos Music A notational sign, especially the sign marking the beginning or the end of a repeat.[Italian, from Latin signum, sign; see sekw- in Indo-European roots.]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.segno (?s?nj??; Italian ?se??o) n, pl -gni (-nji?; Italian -??i) (Music, other) music a sign at the beginning or end of a section directed to be repeated. Symbol: or :S: [Italian: a sign, from Latin signum]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014