1.
~ 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.
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2.
~ 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.
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