answerability comes from answerable + -ity, from answer (Old English andswaru, 'a reply, response') + -able. Morphologically, the word is transparent: -ity and -able is attached to the older base named in the history, so the modern form packages an inherited or borrowed stem inside a later English derivative. In modern use, the noun sense is "the state of being responsible or accountable to someone", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as answer, answerable, answerably, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Old English andswaru, which anchor the explanation in named linguistic material.