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 ).
a suffix of nouns denoting rank or office, sometimes attached to the stem of a word rather than to the word itself: captaincy; magistracy.

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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World English Dictionary
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
[via Old French from Latin -cia, -tia, Greek -kia, -tia, abstract noun suffixes]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

abstract noun suffix of quality or rank, from L. -cia, -tia, from Gk. -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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