Les demandes de définition en français parlé. Aspects grammaticaux et interactionnels

This article aims to analyze a construction which is commonly described as an interrogative structure that speakers use to ask for a clarification of a comprehension problem. In spoken French, <i>ça veut dire quoi?</i> seems to be the most employed form when clarification is required. In many cases, the structure is followed or preceded by a constituent which is co-referential to the clitic <i>ça</i>, thus leading to a dislocated construction, such as <i>ça veut dire quoi quinquennal?</i> First, these forms – as well as similar expressions, like <i>qu'est-ce que ça veut dire</i> – will be analyzed with regards to their information structure (topic/focus). Thereafter, the emphasis is put on the functions which these constructions accomplish in interaction, whereby their sequential positioning as part of an adjacency pair (of the <i>question-answer</i> type) is taken into account. If in numerous cases the second part of the adjacency pair is expected to be <i>ça veut dire…</i>, in other cases the «answer»-part is expressed in another way. On these bases, the analysis will identify the different discourse tasks that speakers engaged in an interaction accomplish by using these forms.