-ancy

-ancy

suff.
Condition or quality: buoyancy.
[Latin -antia and -entia; see -ance.]
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.

-ancy

suffix forming nouns
a variant of -ance, used to indicate condition or quality: expectancy; poignancy; malignancy.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-ancy

a combination of -ance and -y, used to form nouns denoting state or quality: brilliancy.
[< Latin -antia=-ant- -ant + -ia -y3]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.