English
declivitous
Declivitous comes from Latin declivus ‘sloping down’, from clivus ‘slope’, and perhaps ultimately from Proto-Indo-European *ḱley- ‘to lean’.
- Proto-Indo-Europeanc. 4500–2500 BCE*ḱley-1‘to lean’uncertain
- Proto-Indo-Europeanc. 4500–2500 BCE*ḱleywós1‘sloped, curved’uncertain
- Proto-Italicc. 1500–700 BCE*kleiwos1uncertain
- Latinc. 75 BCE–200 CEclivus2‘slope’
- Latinc. 75 BCE–200 CEdeclivus2‘sloping down’
- Englishearliest quotation 1855declivitous2
attested reconstructed ? uncertain or disputed deepest recorded ancestor
- 1 Wiktionary, Latin clivus
- 2 Wiktionary, English declivitous
- Earliest quotation in Wiktionary’s entry: 1855, Pliny, The Natural History of Pliny - Volume 3: “Where the ground is declivitous, it is requisite that…”.
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*ḱley-Wiktionary, Latin clivus‘to lean’uncertain
- Proto-Indo-Europeanc. 4500–2500 BCE*ḱleywósWiktionary, Latin clivus‘sloped, curved’uncertain
- Proto-Italicc. 1500–700 BCE*kleiwosWiktionary, Latin clivusuncertain
- Latinc. 75 BCE–200 CEclivusWiktionary, English declivitous‘slope’
- Latinc. 75 BCE–200 CEdeclivusWiktionary, English declivitous‘sloping down’
- Englishearliest quotation 1855declivitousWiktionary, English declivitous. Earliest quotation in Wiktionary’s entry: 1855, Pliny, The Natural History of Pliny - Volume 3: “Where the ground is declivitous, it is requisite that…”
Linked words
through Proto-Indo-European *ḱley- ‘to lean’
law, low, climate, lean, ladder, lid, climax, inclination, eyelid, incline, clinician, cline, declension, declination, proclivity, 26 more
Today it means
adj Descending gradually; sloping; downhill.
Sources
Sources: Wiktionary, “declivitous”; the older steps come from the Wiktionary entry for Latin clivus. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / Proto-Indo-European *ḱley- / declivitous