-ify

-ify

suff.
Variant of -fy.
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.

-ify

suffix forming verbs
a variant of -fy: intensify.
-ification suffix forming nouns
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-fy

a verbal suffix occurring in loanwords from Latin, with the meanings “to make, cause to be, render” (clarify; purify); “to become, be made” (liquefy).
Compare -ify.
[Middle English < Old French -fier < Latin -ficāre, frequentative derivative of facere to make, do1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.