Abstract This paper reviews a couple of theoretical and methodological issues in grammaticalization research, including in particular the relationship of grammaticalization to the synchrony/diachrony contrast, unidirectionality and degrammaticalization, lexicalization, analogy, reanalysis and lateral conversion. There are misunderstandings, both in the grammaticalization and in the anti-grammaticalization literature, of each of these issues. Grammaticalization, if construed appropriately, comprises a homogeneous set of phenomena and therefore remains a unified field of research and a worthy object of a linguistic theory.
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