Sloping or inclined upward; having a gradient that rises gradually.
From Latin acclinalis, derived from acclinare (to lean toward), combining ad- (toward) + clinare (to lean or bend). The term evolved to describe geological or geographical features that tilt upward.
Geologists use this term to describe hillsides and mountain slopes, but it's rarely used in everyday English—most people just say 'sloping uphill' instead, which is why you'll almost never encounter it outside technical texts.
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