Word Study
Declivity
OXFORD DICTIONARY
Declivity, n. (pl. -ies) a downward slope, esp. a piece of sloping ground.
Derivative
declivitous adj.
Etymology
L declivitas f. declivis (as DE-, clivus slope)
ROGET THESAURUS
Declivity
Obliquity
N obliquity, inclination, slope, slant, crookedness, slopeness, leaning, bevel, tilt, bias, list, twist, swag, cant, lurch, distortion, bend, tower of Pisa, acclivity, rise, ascent, gradient, khudd, rising ground, hill, bank, declivity, downhill, dip, fall, devexity, gentle slope, rapid slope, easy ascent, easy descent, shelving beach, talus, monagne Russe, facilis descensus averni.Descent
N descent, descension, declension, declination, fall, falling, slump, drop, plunge, plummet, cadence, subsidence, collapse, lapse, downfall, tumble, slip, tilt, trip, lurch, cropper, culbute, titubation, stumble, fate of Icarus, avalanche, debacle, landslip, landslide, declivity, dip, hill, rappel, descending, descendent, decurrent, decursive, labent, deciduous, nodding to its fall, downhill, downwards, the bottom fell out.For further exploring for "Declivity" in Webster Dictionary Online