optional

adj. optativo, discrecional, facultativo, no obligatorio, opcional, potestativo

opcional | optativo | facultativo | potestativo

Ex: The program function keys (PF), an optional feature of the terminal, can be programmed to provide the user with special input capabilities.
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*optional subject = asignatura optativa

(adj.) = opcional
Ex: The program function keys (PF), an optional feature of the terminal, can be programmed to provide the user with special input capabilities.
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* optional subject = asignatura optativa