/ keɪ; NAmE / noun , abbreviation
■ noun
(also k ) [ C , U ] ( pl. Ks , K's , k's / keɪz; NAmE /) the 11th letter of the English alphabet :
'King' begins with (a) K / 'K'.
■ abbreviation ( pl. K )
1.
( informal ) one thousand :
She earns 40K (= £40 000) a year.
2.
kilometre(s) :
a 10K race
3.
kelvin(s)