A circular definition is a description of the meaning of a lexeme that is constructed using one or more synonymous lexemes that are all defined in terms of each other.
(Lexemes)
Here is how the circularity can be resolved by the addition of an analytic definition and supplemental information:
This page is an extract from the LinguaLinks Library. Version 5.0 published on CD-ROM by SIL International, 2003.