What does the SI prefix 'centi' mean?

Answer 1

"Centi-" usually means "one hundredth of". One centimeter (cm) is 1/100 of a meter, and similarly one centiliter (cl) is one hundredth of a litre.

However, centiliters are rarely used, as most volume units are in milliliters instead (1cl = 10ml).

Answer 2

Centi means a hundredth of something. Examples are centimeter (a hundredth of a meter) and centigrams (a hundredth of a gram).