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mountaineering

[ moun-tn-eer-ing ]
/ ˌmaʊn tnˈɪər ɪŋ /
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noun
the sport of climbing mountains.
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Origin of mountaineering

First recorded in 1795–1805; mountaineer + -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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