[{"Bold_text": "noun", "List Items": ["the act or process of alternating the state of being alternated .", "alternate ; repeated rotation:the alternation of the seasons.", "Electricity.a single fluctuation in the absolute value of an alternating current alternating currentor voltage from zero to a maximum and back to zero, being equal to one half cycle.", "Linguistics.variation in the form of a linguistic unit as it occurs in different environments or under different conditions, as between the-edand-enforms of the past participle indancedandspokenor between the (t) and (d) pronunciations of the past tense suffix-edinhoppedandrubbed."]}]