There are many words used to describe herbs and their actions on the body. The following is a guide to understanding these unique terms.
Concentration
the amount of material in a solution in relationship to the amount of solvent; expressed as the ratio.
For example:
1:5 concentration means that 5 parts of an extract contains the equivalent of one part of the raw herb;
4:1 concentration means that 1 part of an extract contains the equivalent of 4 parts of the raw herb.
Source: www.cncahealth.com