h₁newn̥
“nine, the number nine”nine, ninth
Root for the number nine, yielding Latin novem, English nine, Greek ennea.
Discussion
The Proto-Indo-European word *h₁newn̥ is the cardinal numeral "nine" and completes the sequence of single-digit numbers reconstructable to the proto-language. The initial laryngeal *h₁ left no direct trace in most daughter languages, and the syllabic nasal *-n̥ developed differently in each branch, though the comparative evidence converges clearly on the reconstructed form.
In Germanic, the word descended into Old English nigon, which became modern English nine. The initial *n- was retained, and Grimm's Law had no effect on nasals. German neun, Dutch negen, and Swedish nio are close cognates. The ordinal ninth follows regular Germanic patterns.
Latin novem "nine" preserves the root well and is the source of November (originally the ninth month in the early Roman calendar, which began in March), novena (a nine-day prayer cycle), and the combining form nona- seen in nonagenarian. The shift from *-n̥ to Latin -em represents a regular Latin development of the syllabic nasal.
Greek ennea "nine" (with a prothetic vowel and assimilation) gave English ennead and the rare ennagon. Sanskrit náva "nine", Lithuanian devyni, Old Irish noí, and Old Church Slavonic devętĭ confirm the numeral across the family, though the Baltic and Slavic forms show considerable remodelling.
A long-standing hypothesis connects *h₁newn̥ "nine" to *néwos "new", suggesting that nine was conceived as the "new" number — the point at which a new counting cycle begins. This would imply a Proto-Indo-European base-ten (or base-nine) counting system. The theory is elegant but remains debated, as the phonological match is not perfect and the semantic motivation is speculative.
Like the other Indo-European numerals, *h₁newn̥ demonstrates the extraordinary stability of basic counting words across five millennia of linguistic change.
Notes
Pokorny 318-319. English nine, November, noon (originally 9th hour).
Related Roots
English Words from *h₁newn̥
These modern English words descend from this root. Each page traces the full journey from PIE to present-day English.