The plural form of dependability; multiple instances or aspects of being reliable and trustworthy.
From dependable (mid-1600s, from depend + -able) plus -ity (Latin -itas, forming abstract nouns) plus -ies (plural). The concept evolved from the Latin dependere (to hang down, rely upon) into the modern sense of something you can count on.
The word 'dependability' became especially important in engineering and psychology during the Industrial Revolution—manufacturers realized that consistency and reliability were worth more than perfection, because workers and machines needed to function reliably day after day.
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