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Nineteen
Numerical Value
Understand 'nineteen' as one more than 18 and one less than 20, a cardinal number. 
Age Milestone
'Nineteen' often represents a significant age in many cultures, symbolizing the last year of being a teenager. 
Ordinals and Dates
In dates, 'nineteen' can be an ordinal number, for example, 19th of a month. 