2. (noun)potassium, K, atomic number 19 a light soft silver-white metallicelement of the alkalimetal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
3. (noun)thousand, one thousand, 1000, M, K, chiliad, G, grand, thou, yard the cardinal number that is the product of 10 and 100
4. (noun)kilobyte, K, KB, kB a unit of information equal to 1000 bytes
5. (noun)kilobyte, kibibyte, K, KB, kB, KiB a unit of information equal to 1024 bytes
6. (noun)K, k the 11th letter of the Roman alphabet
7. (adj)K, jet, super acid, special K, honey oil, green, cat valium, super C street names for ketamine
8. (adj)thousand, one thousand, 1000, m, k denoting a quantity consisting of 1,000 items or units
1. (abbreviation)K kilometer It' about 10K from here.
2. K kilobyte 60,000K memory
3. K kindergarten grades K-12
Definition of 'k'
Webster Dictionary
1. k the eleventhletter of the English alphabet, is nonvocal consonant. The form and sound of the letter K are from the Latin, which used the letter but little except in the early period of the language. It came into the Latin from the Greek, which received it from a Phoenician source, the ultimate origin probably being Egyptian. Etymologically K is most nearly related to c, g, h (which see)
Definitions of 'k'
The New Hacker's Dictionary
1. k [from kilo-] A kilobyte. Used both as a
spoken word and a written suffix (like meg and
gig for megabyte and gigabyte). See
quantifiers.
2. k [rare; poss fr. kilo- prefix]
Extremely. Rare among hackers, but quite common among crackers and
warez d00dz in compounds such as k-kool/K´kool´/, k-rad/K´rad´/, and k-awesome/K´aw`sm/. Also used to intensify
negatives; thus, k-evil, k-lame, k-screwed, and k-annoying. Overuse of this prefix, or use in
moreformal or technical contexts, is considered an indicator of
lamerstatus.
Definitions of k 
