[mu.ta.ble] adj [ME, fr. L mutabilis, fr. mutare to change; akin to OE mithan to conceal, Skt minati he exchanges, deceives] (14c) 1: prone to change: inconstant
2. a: capable of change or of being changed b: capable of or liable to mutation -- mu.ta.bil.i.ty n -- mu.ta.bly adv