Pronunciation: (sē), [key]
pl. C's or Cs, c's or cs.

1. the third letter of the English alphabet, a consonant.
2. any spoken sound represented by the letter C or c, as in cat, race, or circle.
3. something having the shape of a C.
4. a written or printed representation of the letter C or c.
5. a device, as a printer's type, for reproducing the letter C or c.


1. cocaine.
2. Gram.complement.
3. consonant.
4. coulomb.
5. county (used with a number to designate a county road): C55.


1. the third in order or in a series.
2. (sometimes l.c.) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student's work as fair or average.
3. Music.
a. the first tone, or keynote, in the scale of C major or the third tone in the relative minor scale, A minor.
b. a string, key, or pipe tuned to this tone.
c. a written or printed note representing this tone.
d. (in the fixed system of solmization) the first tone of the scale of C major, called do.
e. the tonality having C as the tonic note.
f. a symbol indicating quadruple time and appearing after the clef sign on a musical staff.
4. (sometimes l.c.) the Roman numeral for 100.
5. Celsius.
6. centigrade.
7. Elect.
a. capacitance.
b. a battery size for 1.5 volt dry cells: diameter, 1 in. (2.5 cm); length, 1.9 in. (4.8 cm).
8. Chem.carbon.
9. Physics.
a. charge conjugation.
b. charm1 (def. 9).
10. Biochem.
a. cysteine.
b. cytosine.
11. Also,C-note. Slang.a hundred-dollar bill.
12. a proportional shoe width size, narrower than D and wider than B.
13. a proportional brassiere cup size, smaller than D and larger than B.
14. the lowest quality rating for a corporate or municipal bond.
15. Computers.a high-level programming language often used in conjunction with UNIX and offering a degree of low-level machine control.


1. calorie.
2. Optics.candle; candles.
3. (with a year) about: c1775.
4. Physics, Chem.curie; curies.
5. cycle; cycles.


1. Optics, Physics.the velocity of light in a vacuum: approximately 186,000 miles per second or 299,793 kilometers per second.
2. Acoustics, Physics.the velocity of sound.


(in prescriptions) with.


1. Calorie.
2. Cape.
3. Catholic.
4. Celsius.
5. Celtic.
6. Centigrade.
7. College.
8. (in Costa Rica and El Salvador) colon; colons.
9. Congress.
10. Conservative.


U.S. Mil.
(in designations of transport aircraft) cargo: C-54; C-124.


1. calorie.
2. Optics.candle; candles.
3. carat.
4. carbon.
5. carton.
6. case.
7. Baseball.catcher.
8. cathode.
9. cent; cents.
10. centavo.
12. centigrade.
13. centime.
14. centimeter.
15. century.
16. chairman; chairperson.
17. chapter.
18. chief.
19. child.
20. church.
21. (with a year) about: c. 1775.
22. cirrus.
23. city.
24. cloudy.
25. cognate.
26. color.
27. gallon.
28. copper.
29. copyright.
30. corps.
31. cubic.
32. (in prescriptions) with.
33. cycle; cycles.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.


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