The state or quality of being capable of becoming tired, exhausted, or worn out.
From 'fatigable' + '-ness' noun suffix. Created as a scholarly term in the 1700s to express the abstract concept of exhaustibility.
This word is so specific that it almost never appears outside of scientific papers, but it perfectly captures the engineering concept that every material has limits—every substance has a measurable 'fatigableness' that determines how long it will last.
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