 The mechanistic account (Piccinini 2007, 2015; cf. Kaplan 2011, Milkowski 2013, Fresco 2014, Duwell 2017, Coelho Mollo 2018, Curtis-Trudel forthcoming-b) avoids appealing to both syntax and semantics. Instead, it accounts for concrete computation in terms of the mechanistic properties of a system. According to the mechanistic account, concrete computing systems are functional mechanisms of a special kind—mechanisms that perform concrete computations.