The constitution itself is also a disposition. For Seneca gives a definition of constitutio which is almost certainly derived from Chrysippus: it is the hēgemonikon in a certain relation to the body.
Inwood establishes the Stoic technical meaning of ‘constitution’ as the governing soul-part (hēgemonikon) in its relational disposition to the body, making it the structural ground of self-preservation and primary impulse.
, Ethics and Human Action in Early Stoicism, 1985thesis