C Definition

1. The third letter of the English alphabet.
2. The third highest grade or quality, or a mark indicating this.

Form: C (usually)
3. music.
The note on which the Western system of music is based.
Form: C
4. A musical key with the note C as its base.

1. Celsius.
2. Centigrade.
3. Century.

Example: C19
4. IVR.
Cuba.

1. centum (Latin), the Roman numeral for 100.

Form: c (also)
2. chem.
Carbon.

1. Centi-.
2. Cubic.

1. The speed of light.