1. (v. t.) C is the third letter of the English alphabet. It is from the Latin letter C, which in old Latin represented the sounds of k, and g (in go); its original value being the latter. In Anglo-Saxon words, or Old English before the Norman Conquest, it always has the sound of k. The Latin C was the same letter as the Greek /, /, and came from the Greek alphabet. The Greeks got it from the Ph/nicians. The English name of C is from the Latin name ce, and was derived, probably, through the French. Etymologically C is related to g, h, k, q, s (and other sibilant sounds). Examples of these relations are in L. acutus, E. acute, ague; E. acrid, eager, vinegar; L. cornu, E. horn; E. cat, kitten; E. coy, quiet; L. circare, OF. cerchier, E. search.
2. The keynote of the normal or "natural" scale, which has neither flats nor sharps in its signature; also, the third note of the relative minor scale of the same.
3. C after the clef is the mark of common time, in which each measure is a semibreve (four fourths or crotchets); for alla breve time it is written /.
4. The "C clef," a modification of the letter C, placed on any line of the staff, shows that line to be middle C.
5. As a numeral, C stands for Latin centum or 100, CC for 200, etc.
6. (adj.) being ten more than ninety
7. (n.) street names for cocaine
8. (n.) the 3rd letter of the Roman alphabet
9. (n.) (music) the keynote of the scale of C major
10. (n.) a general-purpose programing language closely associated with the UNIX operating system
11. (n.) a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second
12. (n.) a degree on the centigrade scale of temperature
13. (n.) ten 10s
14. (n.) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
15. (n.) a base found in DNA and RNA and derived from pyrimidine; pairs with guanine
16. (n.) one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
17. (n.) a vitamin found in fresh fruits (especially citrus fruits) and vegetables; prevents scurvy
18. (n.) the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second