Similar words: optional, exceptionally, exceptional, rationally, nationally, conceptional, emotionally, unexceptional. Meaning: ['ɑpʃnəlɪ /'ɒp-] 
adv. in an optional manner.
adv. in an optional manner. 
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61. For example, a data message may optionally contain the "before" data values.
62. Shut the morbid state that disease is psychology oneself optionally?
63. An automatic feeding equipment can be added optionally to improve work efficiency.
64. You can optionally override this method in the derived class to provide a custom initialization routine.
65. All these contents can be either stored in its internal storage space of 648MB or optionally, users can choose to keep it at external SD card (up to 8GB) through its expansion slot.
More similar words: optional, exceptionally, exceptional, rationally, nationally, conceptional, emotionally, unexceptional, fractionally, additionally, irrationally, educationally, functionally, operationally, intentionally, nutritionally, traditionally, conditionally, proportionally, conventionally, internationally, unconditionally, institutionally, unintentionally, constitutionally, option, adoption, soft option, fictionalization, optimization.