Noun

• S: (n) kelvin, K (the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites)
• S: (n) potassium, K, atomic number 19 (a light soft silver-white metallic element of the alkali metal 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)
• S: (n) thousand, one thousand, 1000, M, K, chiliad, G, grand, thou, yard (the cardinal number that is the product of 10 and 100)
• S: (n) kilobyte, K, KB, kB (a unit of information equal to 1000 bytes)
• S: (n) kilobyte, kibibyte, K, KB, kB, KiB (a unit of information equal to 1024 bytes)
• S: (n) K, k (the 11th letter of the Roman alphabet)
• S: (n) K, jet, super acid, special K, honey oil, green, cat valium, super C (street names for ketamine)

Adjective

• S: (adj) thousand, one thousand, 1000, m, k (denoting a quantity consisting of 1,000 items or units)