twenty-nine
twenty-nine
UK[ˈtwenti naɪn]US[ˈtwenti naɪn]
cardinal number
The number equivalent to the product of three and ten; one more than twenty-eight, or one less than thirty; 29.
Morpheme Breakdown
twenty
nine
twenty
20
nine
9
Etymology
The compound 'twenty-nine' is a transparent numeral formed within the Germanic language tradition by combining the tens word 'twenty' with the units word 'nine'. 'Twenty' itself originates from the Old English twēntig, literally 'two tens', built on the root for 'two' with a suffix marking a decade. 'Nine' descends from the Proto-Indo-European numeral h₁néwn̥, which has remained remarkably stable across Indo-European languages. The logic of the modern compound is purely arithmetic, directly representing the sum of twenty and nine, a pattern consistent for all English numerals from twenty-one to ninety-nine.
Analysis
Structure: twenty (20) + nine (9)
- twenty: From Old English twēntig, meaning 'group of twenty'. The root twēn- is related to 'two', and -tig is a suffix denoting a group of ten.
- nine: From Old English nigon, from Proto-Germanic newun, from Proto-Indo-European h₁néwn̥, meaning the cardinal number '9'.
Examples
She celebrated her twenty-ninth birthday with a quiet dinner.
The final score was twenty-nine to twenty-seven.
Twenty-nine is a prime number.