nine-year-old
UK[ˌnaɪn jɪər ˈəʊld]US[ˌnaɪn jɪr ˈoʊld]
adj
Being nine years of age.
n
A person or animal that is nine years old.
Morpheme Breakdown
nine
year
old
nine
numeral
year
time unit
old
adjective
Etymology
The compound "nine-year-old" follows a productive English pattern for forming age-related adjectives and nouns, directly combining native Germanic elements. "Nine" originates from the Proto-Indo-European root h₁néwn̥, which evolved into the numeral across Germanic languages. "Year" stems from the PIE root yer-, signifying a cycle or season, while "old" derives from alt-, conveying the concept of being grown or aged. The hyphenated structure, joining a numeral, a unit of time, and a state of being, creates a transparent and logical descriptor that precisely denotes an entity's specific age, a grammatical construction common in Modern English.
Analysis
Structure: nine (numeral) + year (time unit) + old (adjective)
- nine: From Old English 'nigon', of Germanic origin; related to Dutch 'negen' and German 'neun', from an Indo-European root shared by Latin 'novem' and Greek 'ennea'. Functions as a cardinal numeral.
- year: From Old English 'gēar', of Germanic origin; related to Dutch 'jaar' and German 'Jahr', from an Indo-European root meaning 'season'. Functions as a noun denoting a time period.
- old: From Old English 'ald', of Germanic origin; related to Dutch 'oud' and German 'alt', from an Indo-European root meaning 'grown-up'. Functions as an adjective describing age.
Examples
She has a nine-year-old brother who just started third grade.
The nine-year-old won first prize in the science fair.
This is a book suitable for nine-year-olds.