alteration

Etymology

From Old French alteracion (French altération), from Medieval Latin alterātiō. Morphologically alter + -ation

noun

1. The act of altering or making different.
   …alteration, though it be from worse to better, hath in it inconveniences… 1594, Richard Hooker, Of the Laws of Ecclesiastical Polity
2. The state of being altered; a change made in the form or nature of a thing; a changed condition.
   …and I saw by the alteration in your face that a train of thought had been started. 1892, Arthur Conan Doyle, “The Resident Patient”, in The Memoirs of Sherlock Holmes