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Variant of -ize.
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.


suffix forming verbs
a variant of -ize
Usage: See at -ize
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


Chiefly Brit. var. of -ize: organise.
usage: See -ize.


a noun suffix, occurring in loanwords from French, indicating quality, condition, or function: franchise; merchandise. Compare -ice.
[Middle English < Old French -ise, variant of -ice -ice]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
In British English, verbs that end in -ize can also end in -ise, but not vice versa.
For instance, advertise, advise, franchise, supervise, surprise, televise are just six of the many words that can be spelt only with -ise, which was stressed in my 1950 copy of Fowler's Modern English Usage (about which more follows) - which was much earlier than the 1990s claimed by Mr Scalese to be when it was first used.
The Oxford Dictionary certainly prefers -ize to -ise in those words where both are acceptable.