It's nice when someone compliments your reliability because it means they think you are dependable. Things that are known for reliability? Your best friend, sunrise, sunset and unfortunately also taxes.

The word is a new one and didn't become common until after 1850 during the Industrial Revolution. Before things were mass produced, how reliable they were was not such an issue. Interesting fact: reliability is an American word, and the Brits scoffed at its new usage.

Definitions of reliability
  1. noun
    the quality of being dependable or reliable
    synonyms: dependability, dependableness, reliableness
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    undependability, undependableness, unreliability, unreliableness
    the trait of not being dependable or reliable
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    solidity, solidness
    the quality of being solid and reliable financially or factually or morally
    the quality of never making an error
    duplicability, reproducibility
    the quality of being reproducible
    (Christianity) exemption from error
    papal infallibility
    belief of the Roman Catholic Church that God protects the pope from error when he speaks about faith or morality
    type of:
    responsibility, responsibleness
    a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct
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