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In the same manner throughout. Used chiefly as a direction.
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.
(Classical Music) music (preceding a tempo or dynamic marking) always; consistently. It is used to indicate that a specified volume, tempo, etc, is to be sustained throughout a piece or passage
[Italian: always, from Latin semper]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
(used in musical directions) throughout.
[1885–90; < Italian: always < Latin semper]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited