Definition of "mutable" []

• Capable of or subject to change or alteration. (adjective)
• Prone to frequent change; inconstant: mutable weather patterns. (adjective)
• Tending to undergo genetic mutation: a mutable organism; a mutable gene. (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.

• "Some give this sense of it: "So mutable is even the angelical nature that God would not trust angels with their own integrity; if he had, they would all have done as some did, left their first estate; but he saw it necessary to give them supernatural grace to confirm them.""
• "Not always smoothly — Peirce himself parted ways with his fellow pragmatist William James, largely over the idea that truth was mutable, that is, what is "true" can become not true and even then true again, depending on the situation."
• "Your sign is ruled by Mercury and is what's known as a mutable sign - which means changeable."