The act or practice of traveling by boat; boating (a less common variant).
From 'boat' + '-tion' (Latin-derived suffix creating nouns from verbs), similar to how 'vacation' comes from 'vacate'; this is a more formal version of 'boating'.
While 'boation' was used in older English texts, 'boating' eventually won out because it's shorter and more natural-sounding—it's a great example of how language naturally selects simpler competing forms.
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