英语词汇alternating的起源、历史背景-英语词源词典

词汇	alternating
词源	alternating adj. 1550s, "occurring or acting by turns, one after the other," present-participle adjective from alternate (v.). Electrical alternating current is recorded from 1839, an electrical current which flows alternately in opposite directions without interruption. Entries linking to alternating alternate v. 1590s, "do by turns" (transitive), from Latin alternatus, past participle of alternare "do one thing and then another, do by turns," from alternus "one after the other, alternate, in turns, reciprocal," from alter "the other" (see alter). Replaced Middle English alternen "to vary, alternate" (early 15c.). Transitive meaning "interchange reciprocally" is from 1850; intransitive sense "follow one another in time or place" is from c. 1700; that of "pass back and forth between actions, conditions, etc." is by 1823. Related: Alternated; alternating. updated on September 18, 2022
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alternating adj.