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Or else. Used as a direction to the performer to designate an alternate section or passage.
[Italian, from o sia, or let it be : o, or (from Latin aut) + sia, third person sing. present subjunctive of essere, to be (from Latin esse; see es- 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.
an alternate version or passage
(in musical direction) or
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
or (used when suggesting an easier alternative)
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited