six-year

The compound 'six-year' is a modern English formation following the common Germanic pattern of combining a number with a unit of time to create a descriptive adjective. The first element, 'six', descends from the Proto-Indo-European root s(w)eḱs, which is the stable ancestor for the number across many Indo-European languages, including Latin 'sex' and Greek 'hex'. The second element, 'year', originates from the Proto-Germanic jǣram, itself from the Proto-Indo-European root yer-, meaning 'year' or 'season'. The logic of the compound is transparently literal, directly combining the quantity 'six' with the cyclical time unit 'year' to specify a duration. This straightforward numerical-time construction is a productive method in English for creating precise temporal modifiers, as seen in similar forms like 'two-day' or 'ten-week'.

Structure: six (number) + year (time period) - six: From Old English 'siex', of Germanic origin; related to Dutch 'zes' and German 'sechs', from an Indo-European root shared by Latin 'sex' and Greek 'hex'. Functions as a cardinal number. - year: From Old English 'gēar', of Germanic origin; related to Dutch 'jaar' and German 'Jahr', from an Indo-European root shared by Greek 'hōra' 'season'. Functions as a noun denoting a time period.