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English to English noun
| 1 |
successive change from one thing or state to another and back again |  | Example: a trill is a rapid alternation between the two notes
source: wordnet30
| 2 |
The reciprocal succession of things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and night, cold and heat, summer and winter, hope and fear. | | source: webster1913
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