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-cy

1.
a suffix used to form abstract nouns from adjectives with stems in -t, -te, -tic, and especially -nt (democracy; accuracy; expediency; stagnancy; lunacy), and sometimes used to form action nouns (vacancy; occupancy).
2.
a suffix of nouns denoting rank or office, sometimes attached to the stem of a word rather than to the word itself:
captaincy; magistracy.
Origin
representing French -cie, -tie, Latin -cia, -tia, Greek -kia, -keia, -tia, -teia; in most cases to be analyzed as consonant + -y3: the consonant making the whole or the last member of the preceding morpheme
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -cy

-cy

suffix
1.
(forming nouns from adjectives ending in -t, -tic, -te, and -nt) indicating state, quality, or condition plutocracy, lunacy, intimacy, infancy
2.
(forming abstract nouns from other nouns) rank or office captaincy
Word Origin
via Old French from Latin -cia, -tia, Greek -kia, -tia, abstract noun suffixes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for -cy

abstract noun suffix of quality or rank, from Latin -cia, -tia, from Greek -kia, -tia, from abstract ending -ia + stem ending -c- or -t-. The native correspondents are -ship, -hood.

Online Etymology Dictionary, © 2010 Douglas Harper
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