This volume aims to promote a discussion on the definition of collocation that will be useful for lexicographic purposes. Each of the papers in the volume contains addresses in detail one or more aspects of three main issues. The first issue concerns, on the one hand, the boundaries between collocations and other word combinations, and the way in which lexicographers convey classifications to dictionary users. The second issue is the possibility, or even necessity, of adapting the definition of collocation to the objectives of different types of dictionaries, taking into account their specific micro- and macro-structural properties and their users' needs. The third issue concerns the methods for collocation extraction. In order to tailor the definition of collocation to the actual dictionary function, it is necessary to develop hybrid methods relying on corpus-based approaches and combining data processing with criteria such as native speakers' evaluation and contrastive analysis.