We present a method for grouping the synonyms of a lemma according to its
dictionary senses. The senses are defined by a large machine readable
dictionary for French, the TLFi (Tr\'esor de la langue fran\c{c}aise
informatis\'e) and the synonyms are given by 5 synonym dictionaries (also for
French). To evaluate the proposed method, we manually constructed a gold
standard where for each (word, definition) pair and given the set of synonyms
defined for that word by the 5 synonym dictionaries, 4 lexicographers specified
the set of synonyms they judge adequate.