Etymology
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acclivity (n.)

"upward slope of ground," 1610s, from Latin acclivitatem (nominative acclivitas) "an ascending direction, rising grade, upward steepness," from acclivis "mounting upwards, ascending," from ad "to, up to" (see ad-) + clivus "hill, a slope," from PIE *klei-wo-, suffixed form of root *klei- "to lean."

Origin and meaning of acclivity

updated on October 13, 2021

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Definitions of acclivity from WordNet

acclivity (n.)
an upward slope or grade (as in a road);
Synonyms: ascent / rise / raise / climb / upgrade
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.