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A centimetre (international spelling) or centimeter (American spelling) (SI symbol cm) is a unit of length in the International System of Units (SI) equal
A centimetre (international spelling) or centimeter (American spelling) (SI symbol cm) is a unit of length in the International System of Units (SI) equal
etc is used at the end of a list to indicate that you have mentioned only some of the items involved and have not given a full list. etc is a written abbreviation for 'et cetera'.