k , K n pl , k's, K's, Ks
1 the 11th letter and 8th consonant of the modern English alphabet
2 a speech sound represented by this letter, usually a voiceless velar stop, as in kitten
a.k.a. , AKA abbrev. for also known as
k symbol for
2 (Maths) the unit vector along the z-axis
K symbol for
3 (Chem) potassium
(from New Latin kalium)
6 one thousand
(from kilo-)
a a unit of 1024 words, bits, or bytes
b (not in technical usage) 1000
8 international car registration for Cambodia
K , K. abbrev. for Köchel: indicating the serial number in the catalogue (1862) of the works of Mozart made by Ludwig von Köchel, (1800--1877)
k. abbrev. for
K-meson n another name for →
kaon
K ration n
a small package containing emergency rations used by U.S. and Allied forces in the field in World War II
(C20: K, from the initial of the surname of Ancel Keys (born 1904), US physiologist who instigated it)
K/T boundary n
(Geology)
a Cretaceous/Tertiary boundary: the time zone comprising the end of the Cretaceous and the beginning of the Tertiary periods
b (as modifier)
K/T boundary sediments
(C20 K and T, symbols for Cretaceous and Tertiary, respectively)
K'ung Fu-tse n the Chinese name of →
Confucius
O.K.
Informal sentence substitute
1 an expression of approval, agreement, etc. adj, adv
2 in good or satisfactory condition vb , O.K.s, O.K.ing , O.K.ed
3 to approve or endorse n pl , O.K.s
4 approval or agreement, (Also)
OK, o.k, okay (C19: perhaps from o(ll) k(orrect), jocular alteration of all correct)
vitamin K n pl , K vitamins any of the fat-soluble vitamins, including phylloquinone and the menaquinones, which are essential for the normal clotting of blood