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Finding coreferences in corpora is a difficult task for which the identification of singletons is an important issue. Solving this issue would allow for improving the process of corpus annotation and the identification of referential chains. To achieve this, it is important to determine whether or not singletons have linguistic properties of their own. After an overview of the question, the article presents a corpus study. Based on the results of the study, it is possible to “profile” the mentions of a referent remaining in the singleton state. A thousand mentions were studied in different genres and types of texts. The results suggest that the genre/text type and the ontological category of the referent predict the repetition or the absence of repetition of a referent in a text.

[full article, abstract in French; abstract in English] Au début des années 2000, avec l’informatisation, seuls les modes de recherche dans les dictionnaires avaient évolué. A cette période, on se réjouissait de pouvoir faire facilement des recherches thématiques dans les dictionnaires, grâce notamment à des outils de recherche « plein texte ». Parallèlement, on s’inquiétait de la fiabilité des dictionnaires « collaboratifs », conçus grâce aux technologies du wiki et dans lesquels les utilisateurs pouvaient faire des modifications. Aujourd’hui, de nouveaux dictionnaires apparaissent : des dictionnaires que l’on peut fabriquer soi-même, à l’aide d’outils simples d’utilisation, et qui permettent à chacun de personnaliser son dictionnaire. L’article montrera que la personnalisation des dictionnaires change de façon radicale notre rapport au savoir (nous construisons nous-même notre ouvrage de référence), notre rapport à l’expert (serions-nous tous des lexicographes ?) et notre rapport même à l’utilisation du dictionnaire, puisqu’il devient un outil personnel et non plus un outil de partage. Mots-clés: lexicographie, dictionnaires, wiki, nouvelles technologies. Dictionaries: from information-sharing tools to highly customized objects In the early 2000s, only search modes in dictionaries had evolved. In this period, it was challenging to be able to make easily thematic researches in dictionaries, due to “full text” research tools. At the same time, we were questioning about the reliability of the "collaborative" dictionaries, designed thanks to the technologies of the wiki and in which the users could make modifications. Today, new dictionaries appear: dictionaries made by the user himself, for himself, by means of easy to use tools, and which allow every user to make his dictionary. The article will show that the customization of dictionaries changes in a radical way our relation to the knowledge (we build ourselves our reference book), our relation to the expert (would we be all lexicographers?) and our way of using the dictionary, because it becomes a personal tool and it is no more a way of sharing a language.