1. c - Noun
2. c - Verb
3. c - Adverb
4. c - Preposition
6. c - Adjective Satellite
7. C - Proper noun
8. c - Symbol
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.
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 /.
The "C clef," a modification of the letter C, placed on any line of the staff, shows that line to be middle C.
As a numeral, C stands for Latin centum or 100, CC for 200, etc.
Source: Webster's dictionary