What does acclivity mean?
An acclivity is an upward slope — a stretch of ground, road, or terrain that rises as it extends away from the observer. The word is the formal opposite of 'declivity', which denotes a downward slope, and both derive from the same Latin root relating to leaning or sloping. Acclivity belongs chiefly to formal and literary registers: it appears in travel writing, landscape description, military accounts of terrain, and older geographical prose, whereas everyday conversation favors simpler terms such as 'rise', 'incline', or 'uphill stretch'. Writers value it for its precision and for the elegant symmetry it offers when paired with 'declivity' to describe contrasting features of a landscape. Related adjectival forms include 'acclivitous' and the rarer 'acclivous', both meaning sloping upward. Though never common in casual speech, acclivity remains a useful term for anyone describing topography with accuracy and style.
nounAn upward slope of ground or a road; the opposite of a declivity.
- An upward slope or ascent of ground, road, or terrain.
"The cyclists dismounted and pushed their bikes up the steep acclivity beyond the village."
"The hikers paused to catch their breath halfway up the long acclivity."
"From the crest of the acclivity, the whole valley lay open below them."
The plural is regular; it is used when describing terrain with multiple upward slopes.
"The trail was broken by a succession of short, sharp acclivities."
Acclivity and declivity are perfect opposites that come from the same Latin verb meaning 'to lean' — one leans up, the other leans down.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of acclivity
Acclivity comes from the Latin noun acclivitas, derived from acclivis ('sloping upward'), which combines the prefix ad- ('toward') with clivus ('slope' or 'hill'). Clivus itself traces back to the Proto-Indo-European root *klei-, meaning 'to lean' or 'to incline', the same root that gives us words such as 'incline', 'decline', 'recline', and 'climax' (via Greek klimax, 'ladder'). The word entered English in the early seventeenth century, borrowed directly from Latin learned vocabulary alongside its counterpart 'declivity'.
Related word forms
How acclivity is actually used
Acclivity is a formal, somewhat literary word, most often encountered in descriptive writing about landscape, travel writing, and military or topographical prose. In everyday speech, speakers would normally say 'uphill slope', 'rise', or 'incline' instead. It is almost always used in contrast with its antonym 'declivity'.
Easily confused with acclivity
An acclivity is an upward slope, while a declivity is a downward slope — they are direct opposites.