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al·terne | \ ˈȯlˌtərn \
plural -s
Definition of alterne
: one of a group of adjoining plant communities usually sharply differentiated from one another
a grass alterne on the southward-facing slope of a ridge contrasted with forest alterne on the northward-facing slope
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Time Traveler for alterne
The first known use of alterne was in 1916
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