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1) not changing or fluctuating <the patient's condition was listed as \stable>
2) not subject to insecurity or emotional illness <a \stable personality>
3 a) not readily altering in chemical makeup or physical state <\stable emulsions>
b) not spontaneously radioactive <a \stable isotope>
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sta·ble (staґbəl) 1. not moving, fixed, firm. 2. constant (def. 1).Medical dictionary. 2011.