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⇱ C, c - WordReference.com Dictionary of English



WordReference Random House Learner's Dictionary of American English © 2026
C, c /si/USA pronunciation   n. [countable], pl. Cs or C's, cs or c's. 
  1. Linguisticsthe third letter of the English alphabet, a consonant.

C,  Symbol.
  1. Education[sometimes: c] (in some grading systems) a grade or mark indicating fair or average quality.
  2. Music and Dance
    • the tonic note of the C major scale.
    • a written or printed note representing this tone.
  3. [sometimes: c] the Roman numeral for 100.
  4. PhysicsCelsius:The temperature is 10°C (said as "10 degrees Celsius'').
  5. Physicscentigrade.
  6. Chemistrycarbon.
  7. Also, C-note. Slang. a hundred-dollar bill.

c,  an abbreviation of: circa
  1. (used with a year):c1775.

c, [Symbol.]
  1. Optics, Physicsthe velocity of light in a vacuum: approximately 186,000 miles per second or 299,793 kilometers per second.
  2. Physicsthe velocity of sound.

C.,  an abbreviation of:
  1. ThermodynamicsCalorie.
  2. EducationCollege.
  3. Conservative.

c.,  an abbreviation of:
  1. Thermodynamicscalorie.
  2. Jewelrycarat.
  3. Physicscentigrade.
  4. Weights and Measurescentimeter.
  5. chapter.
  6. circa (used with a year):c. 1775.
  7. copyright.
  8. Weights and Measurescubic.

WordReference Random House Unabridged Dictionary of American English © 2026
C, c  (sē),USA pronunciation n., 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
  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.

C, 
    1. Drugscocaine.
    2. Education, Grammar[Gram.]complement.
    3. Music and Danceconsonant.
    4. Physicscoulomb.
    5. county (used with a number to designate a county road):C55.

C,  Symbol.
  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.]
    • Phoneticsthe first tone, or keynote, in the scale of C major or the third tone in the relative minor scale, A minor.
    • Music and Dancea string, key, or pipe tuned to this tone.
    • Phoneticsa written or printed note representing this tone.
    • (in the fixed system of solmization) the first tone of the scale of C major, called do.
    • the tonality having C as the tonic note.
    • 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.]
    • capacitance.
    • a battery size for 1.5 volt dry cells: diameter, 1 in. (2.5 cm);
      length, 1.9 in. (4.8 cm).
  8. Chemistrycarbon.
  9. [Physics.]
    • charge conjugation.
    • charm1 (def. 9).
  10. [Biochem.]
    • cysteine.
    • cytosine.
  11. Also, C-note. [Slang.]a hundred-dollar bill.
  12. Clothinga proportional shoe width size, narrower than D and wider than B.
  13. Clothinga proportional brassiere cup size, smaller than D and larger than B.
  14. Stock Exchange, Businessthe lowest quality rating for a corporate or municipal bond.
  15. Computinga high-level programming language: very powerful and flexible, it is used in a wide variety of applications.

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

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

c̄, 
  1. (in prescriptions) with.
  • Latin cum

C., 
    1. Calorie.
    2. Place NamesCape.
    3. ReligionCatholic.
    4. PhysicsCelsius.
    5. Celtic.
    6. PhysicsCentigrade.
    7. EducationCollege.
    8. Currency(in Costa Rica and El Salvador) colon;
      colons.
    9. GovernmentCongress.
    10. GovernmentConservative.

C-, [U.S. Mil.]
  1. Military(in designations of transport aircraft) cargo:C-54; C-124.

c., 
    1. calorie.
    2. Opticscandle;
      candles.
    3. Jewelrycarat.
    4. Chemistrycarbon.
    5. carton.
    6. case.
    7. [Baseball.]catcher.
    8. Electricitycathode.
    9. Currencycent;
      cents.
    10. Currencycentavo.
    11. [Football.]center.
    12. Physicscentigrade.
    13. Currencycentime.
    14. Weights and Measurescentimeter.
    15. century.
    16. chairman;
      chairperson.
    17. chapter.
    18. chief.
    19. child.
    20. church.
    21. (with a year) about:c. 1775.
    22. Meteorologycirrus.
    23. city.
    24. cloudy.
    25. Linguisticscognate.
    26. color.
    27. Weights and Measuresgallon.
    28. Chemistrycopper.
    29. copyright.
    30. corps.
    31. Weights and Measurescubic.
    32. (in prescriptions) with.
    33. cycle;
      cycles.

C++, n. 
  1. Computinga high-level programming language, a descendant of C, with the ability to manipulate object-oriented features.

'C, c' also found in these entries (note: many are not synonyms or translations):

Forum discussions with the word(s) "C, c" in the title:

-c or -cal
...some <things-to-pay-attention-to> particular to C#
'Ot c'n I do f'yer!'
'Proper' list format: a, b[,] [and/or] c
'The scope of this (or the) new constitution' - capital C?
(a, b, c, ...) or (a, b, c...) or (a,b,c ...) (in listings)
(R.E. V.C.)
[articles] - at <a/the> heating rate of 10°C/min
[The categories / In the categories] are A, B, C, and D.
[the] Washington D.C.
& c
±0.5°c
15Five, D. H. C. O.
1920 - 1690 b.c.e: How to say it.
1st half of the 1st millennium B.C.
21st C: what does it stand for?
3 C's or 3Cs [three / letter plural]
36.5˚ C [reading out or saying]
42 u.s.c. § 10607 ?
a loaf of farmhouse bread nestled within an embroidered c
a : b = c : d
a 34 C
a A, B, and C
A and B and C
A and B of C
A and B or C
A and B share something and so does C
a and b the c of d
A as over against B, is as the proportion of C over against D?
A causes B causes C
more...

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