English

cline

Cline comes from Ancient Greek κλῑ́νω ‘to lean, incline’, and goes back to Proto-Indo-European *ḱley-.

attested reconstructed ? uncertain or disputed deepest recorded ancestor

¹ Wiktionary, Proto-Indo-European *ḱl̥néyti
² Wiktionary, Ancient Greek κλίνω
³ Wiktionary, English cline
Earliest quotation in Wiktionary’s entry: 2005, Ronnie Cann, Ruth Kempson: “This account effectively reconstructs the well-known grammaticalisation cline from…”.

Lineage

Proto-Indo-Europeanc. 4500–2500 BCE*ḱley-1Wiktionary, Proto-Indo-European *ḱl̥néyti‘to incline’reconstructed
Proto-Indo-Europeanc. 4500–2500 BCE*ḱl̥-né-y-ti2Wiktionary, Ancient Greek κλίνω‘to lean’reconstructed
Proto-Hellenicc. 2200–1600 BCE*klíňňō2Wiktionary, Ancient Greek κλίνωreconstructed
Ancient Greekc. 800–300 BCEκλῑ́νω3Wiktionary, English clineklī́nō‘to lean, incline’
Englishearliest quotation 2005cline3Wiktionary, English cline. Earliest quotation in Wiktionary’s entry: 2005, Ronnie Cann, Ruth Kempson: “This account effectively reconstructs the well-known grammaticalisation cline from…”

Introduced by English evolutionary biologist and eugenicist Julian Huxley in 1938 after British mycologist John Ramsbottom suggested the term.

noun A gradation in a character or phenotype within a species, deme, or other systematic group.

Sources: Wiktionary, “cline”; the older steps come from the Wiktionary entries for Proto-Indo-European *ḱl̥néyti, Ancient Greek κλίνω. 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.