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Acclivity

Webster's Dictionary 1913

Ac‐cliv″i‐ty, n.; 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.