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Definition of treeline noun from the Oxford Advanced Learner's Dictionary

treeline

noun
 
/ˈtriːlaɪn/
 
/ˈtriːlaɪn/
(also tree line)
[singular]
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  1. a level of land, for example on a mountain, above which trees will not grow
    • There’s still some snow above the treeline.
    Topics Geographyc2
See treeline in the Oxford Advanced American Dictionary
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