—n.
1 one more than eighteen, nine more than ten.
2 the symbol for this (19, xix, XIX).
3 a size etc. denoted by nineteen.
—adj. that amount to nineteen.
Phrases and idioms:
talk nineteen to the dozen see DOZEN.
Derivatives:
nineteenth adj. & n.
Etymology: OE nigontyne
Useful english dictionary. 2012.