Meaning of -CY in English
~ replaces ‘-te’, ‘-t’, and ‘-tic’ at the end of some adjectives to form nouns referring to the state or quality described by the adjective.
...the emotional intimacy of a family...
They were sworn to secrecy.
~ is added to some nouns referring to people with a particular rank or post in order to form nouns that refer to this rank or post.
He is likely to retain the England captaincy.
...the university chaplaincy.
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012