The capacity or tendency of something to become exhausted, worn out, or damaged through stress or repeated use.
From 'fatiguable' (capable of being fatigued) + '-ity' suffix. A technical term used primarily in materials science and engineering since the 1800s.
Engineers obsess over 'fatiguability' because understanding it has saved countless lives—it's why airplane designers test materials to see how many times they can bend before breaking. Your smartphone battery has fatiguability too: it weakens with each charge cycle!
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