/ en; NAmE / noun , abbreviation
■ noun (also n ) ( pl. Ns , N's , n's / enz; NAmE /)
1.
[ C , U ] the 14th letter of the English alphabet :
'Night' begins with (an) N / 'N'.
2.
[ U ] ( mathematics ) used to represent a number whose value is not mentioned :
The equation is impossible for any value of n greater than 2.
—see also nth
■ abbreviation
1.
( NAmE also No. ) north; northern :
N Ireland
2.
newton(s)