The quality or state of being available; the condition of being accessible, obtainable, or ready for use.
From 'available' plus the suffix '-ity' indicating a state or condition. 'Available' comes from Old French 'availer' meaning 'to be of use,' ultimately from Latin 'ad valere' meaning 'to be strong.' The concept evolved from physical strength to usefulness to accessibility over several centuries.
In our digital age, 'availability' has become a crucial technical term - '99.9% availability' might sound impressive, but it actually means your service could be down for over 8 hours per year! The psychology of availability also affects our decision-making: we tend to overestimate the likelihood of events we can easily remember, a cognitive bias psychologists call the 'availability heuristic.'
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