• IPA: /ˈmjuːtəbl̩/

mutable

1. Changeable, dynamic, evolutive; inclined to change, evolve, mutate.
   • 1608, William Shakespeare, The Tragedy of Coriolanus, [Act III, scene i]:

     For the mutable ranke-ſented Meynie, / Let them regard me, as I doe not flatter, / And therein behold themſelues.

   • 1671, John Milton, “Samson Agonistes, […]”, in Paradise Regain’d. A Poem. In IV Books. To which is Added, Samson Agonistes, London: Printed by J. M[acock] for John Starkey […], OCLC 228732398 ↗, lines 415–420, page 83 ↗:

     Maſters commands come with a power reſiſtleſs / To ſuch as owe them abſolute ſubjection; / And for a life who will not change his purpoſe? / (So mutable are all the ways of men) / Yet this be ſure, in nothing to comply / Scandalous or forbidden in our Law.

2. (programming, of a variable) Having a value that is changeable during program execution.
   • 2011, David Flanagan, JavaScript: The Definitive Guide:

     A value of a mutable type can change. Objects and arrays are mutable: a JavaScript program can change the values of object properties and array elements. Numbers, booleans, null, and undefined are immutable.

• immutable

• French: mutable
• German: mutabel, veränderlich, veränderbar
• Portuguese: mutável
• Russian: изме́нчивый
• Spanish: mutable

mutable (plural mutables)

1. Something mutable; a variable or value that can change.