c

/si:/

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A student writes the letter C on a chalkboard.

Definition

Noun:
- The third letter of the modern English and Roman alphabet: "C" is a consonant.
- A musical note: In Western music, "C" is the first note of the scale of C major.
- A grade or mark: In academic grading, "C" often represents an average or satisfactory level of achievement.
- A Roman numeral: "C" represents the number one hundred.
- A computer programming language: "C" is a widely used, general-purpose programming language.
- A unit of electrical charge: The coulomb, abbreviated "C", is the standard unit of electric charge.
- The chemical symbol for Carbon: "C" represents the element carbon on the periodic table.
- The symbol for the speed of light: In physics, "c" denotes the constant speed of light in a vacuum.
- A symbol for temperature: "°C" stands for degrees on the Celsius (centigrade) temperature scale.
- A vitamin: Vitamin C, or ascorbic acid, is an essential nutrient.
- A nucleotide base: In genetics, "C" stands for cytosine, one of the four bases in DNA and RNA.
Adjective:
- Shaped like the letter C: Having a curved form similar to the capital letter C.

Usage Examples

Noun:
- The word "cat" begins with the letter c.
- The song is in the key of C major.
- She received a C on her history exam.
- The Roman numeral C equals 100.
- Many operating systems are written in the C programming language.
- The charge of an electron is approximately -1.602 × 10⁻¹⁹ C.
- Diamond is a form of the element C (carbon).
- In Einstein's equation E=mc², c is the speed of light.
- Water boils at 100 °C.
- Oranges are a good source of vitamin C.
- In a DNA sequence, C (cytosine) pairs with G (guanine).
Adjective:
- The dancer formed a C shape with her body.

Advanced Usage

"C-suite": Refers collectively to a company's most important senior executives, whose titles often begin with "C" (e.g., CEO, CFO, COO).
- Decisions about mergers are made at the C-suite level.
"C-note": (U.S. slang) A one-hundred-dollar bill (from the Roman numeral C for 100).
- He paid for the dinner with a C-note.

Variants and Related Words

c.: Abbreviation for "circa" (meaning "approximately," used with dates).
- The artifact dates from c. 1500 BCE.
C# / C++: Object-oriented programming languages derived from C.
c/o: Abbreviation for "care of," used when sending mail to someone at another person's address.
- Send the package to Jane Doe, c/o John Smith.

Synonyms

Related Phrases (Phrasal Verbs)

To get a C in (a subject): To receive a grade of C.
- I was relieved to get a C in calculus, as it was a very difficult course.

Related Idioms

"Straight A's and B's, no C's": An expression emphasizing high academic achievement without any average grades.
- Her report card showed straight A's and B's, no C's.
"Mind your P's and Q's" (Note: This is a common idiom about letters, though it uses P and Q, not C. It means to be on your best behavior).

A student writes the letter C on a chalkboard.

Adjective

Noun

street names for cocaine
the 3rd letter of the Roman alphabet
(music) the keynote of the scale of C major
a general-purpose programing language closely associated with the UNIX operating system
a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second
ten 10s
an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
a base found in DNA and RNA and derived from pyrimidine; pairs with guanine
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
a vitamin found in fresh fruits (especially citrus fruits) and vegetables; prevents scurvy
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
a degree on the centigrade scale of temperature

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