 Since Aristotle gives form priority over matter, we would expect him similarly to give actuality priority over potentiality. And that is exactly what we find (Θ.8, 1049b4–5). Aristotle distinguishes between priority in logos (account or definition), in time, and in substance. (1) Actuality is prior in logos since we must cite the actuality when we give an account of its corresponding potentiality. Thus, ‘visible’ means ‘capable of being seen’; ‘buildable’ means ‘capable of being built’(1049b14–16). (2) As regards temporal priority, by contrast, potentiality may well seem to be prior to actuality, since the wood precedes the table that is built from it, and the acorn precedes the oak that it grows into. Nevertheless, Aristotle finds that even temporally there is a sense in which actuality is prior to potentiality: “the active that is the same in form, though not in number [with a potentially existing thing], is prior [to it]” (1049b18–19). A particular acorn is, of course, temporally prior to the particular oak tree that it grows into, but it is preceded in time by the actual oak tree that produced it, with which it is identical in species. The seed (potential substance) must have been preceded by an adult (actual substance). So in this sense actuality is prior even in time.