Rising or sloping upward; characterized by an ascending gradient.
From Latin acclivosus, derived from acclivus (ascending), combining ad- (toward) + clivus (slope). This adjectival form emphasizes the rising nature of terrain.
This adjective form is essentially extinct in modern English, demonstrating how specialized geographical vocabulary gets replaced by everyday words—nobody says 'acclivous terrain' when 'uphill slope' works perfectly.
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