noun, plural acclivities.
an upward slope, as of ground; an ascent (opposed to declivity ).

1605–15; < Latin acclīvitās, equivalent to acclīv(is) steep (ac- ac- + -clīvis, adj. derivative of clīvus slope) + -itās -ity

acclivitous, acclivous [uh-klahy-vuhs] , adjective
unacclivitous, adjective
unacclivitously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acclivity (əˈklɪvɪtɪ)
n , pl -ties
Compare declivity an upward slope, esp of the ground
[C17: from Latin acclīvitās, from acclīvis sloping up, steep]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1610s, from L. acclivitas "an ascending direction, an upward steepness," from acclivis "mounting upwards, ascending," from ad- "up" + clivus "hill, a slope," from PIE *klei-wo-, suffixed form of *klei "to lean" (see lean (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Your indite acclivity is a suitable modelling of it.
We came to a steep acclivity, and, under the stimulating influence of the teamsters.
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