That can be altered: alterable clothing; alterable conditions of employment. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "alterable" in a sentence
"It has the status of a binding executive order in domestic law — and amendable, alterable, and revocable should the President want to doit."
"It was believed that the brain's circuitry was only alterable in certain "critical periods," or brief windows of extreme plasticity; these were thought to occur in childhood, when experience helped to form the brain's circuitry."
"Other matters are considered a product of human law, which is alterable if the church thinks that doing so is in its best interest."