This article develops an alternative definition of a migrant that embraces the perspective of mobility. Starting from the observation that the term 'migrant' has become a stigmatizing label that problematizes the mobility or the residency of people designated as such, we investigate the implications of nation-state centered conceptions of migration which define migration as movement from nation-state A to nation-state B. By asking 'Who is a migrant in Europe today?' we show that nation-state

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... tered understandings of migration rest on a deeply entrenched methodological nationalism and implicate three epistemological traps that continue to shape much of the research on migration: first, the naturalization of the international nation-state order that results, secondly, in the ontologisation of 'migrants' as ready-available objects of research, while facilitating, thirdly, the framing of migration as problem of government. To overcome these epistemological traps, we develop an alternative conception of migration that, inspired by the autonomy of migration approach, adopts the perspective of mobility while highlighting the constitutive role that nation-states' bordering practices play in the enactment of some people as migrants. Importantly, this definition allows to turn the study of instances of migrantisation into an analytical lens for investigating transformations in contemporary border and citizenship regimes.