Definition of "unalterability" []

• Unalterableness. (noun)

The Century Dictionary (Public Domain)

• "On the third point: the indissolubility and unalterability of which"
• "He read on her set lips the unalterability of her determination."
• "Aluminum is used principally in castings and drawn and pressed ware, for purposes in which lightness, malleability, and unalterability under ordinary chemical reagents are desired."