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This paper intends to analyse some controversial questions about phraseological collocations. All these questions arise, at the level of semantics, when the most usually accepted definition of this term is compared with a variety of examples, considered as such phraseological units in literature. It is discussed if collocations conform a semantic unity or if they are both sintactically and semantically analytic sequencies; if collocations have idiomatic character or not; and if they are phenomena belonging to the functional system or to the norm in language. In order to carry out this analysis, we start pointing out a prototypical definition of collocations, trying to show next, through different classifications, some examples not corresponding plainly in their semantic structure to the referred prototypical definition.
