The cardinal number equivalent to the sum of ten and nine; 19. The number following eighteen and preceding twenty.
From Old English 'nigontēne', combining 'nigon' (nine) + 'tēne' (ten). The Germanic construction pattern of adding '-teen' to single digits to form numbers 13-19 is unique among Indo-European languages.
Nineteen has an unusual mathematical property - it's the largest prime number that's also a 'teen' number, making it special in both linguistics and mathematics. The word also marks the linguistic boundary where English switches from the '-teen' pattern to the 'twenty' pattern.
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