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reliability (n.)

"state or quality of being reliable," 1816, Coleridge, from reliable + -ity. In statistics, by 1910.

[Coleridge] evades the only charge brought against [Southey], by repelling one not brought against him, except by his Antijacobin patrons—and answers for his friend, as if he was playing at cross-purposes. Some people say, that Mr Southey has deserted the cause of liberty : Mr Coleridge tells us, that he has not separated from his wife. They say, that he has changed his opinions : Mr Coleridge says, that he keeps his appointments ; and has even invented a new word, reliability, to express his exemplariness in this particular. [from a review of "Biographia Literaria" in Edinburgh Review, August 1817]

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Definitions of reliability from WordNet

reliability (n.)
the quality of being dependable or reliable;
Synonyms: dependability / dependableness / reliableness
From wordnet.princeton.edu