2 definitions found From WordNet (r) 2.0 [wn]: acclivity noun: an upward slope or grade (as in a road); "the car couldn't make it up the rise" [syn: {ascent}, {rise}, {raise}, {climb}, {upgrade}] [ant: {descent}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Acclivity \Ac*cliv"i*ty\, noun; pl. {Acclivities}. [L. acclivitas, fr. acclivis, acclivus, ascending; ad + clivus a hill, slope, fr. root kli to lean. See {Lean}.] A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent.

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