Exploitation is a zero-sum game by which the exploitee must lose in order for the exploiter to gain.
Exploitation is an entire system such that as soon as the manufacturer's exploitation is at an end, the labor receives his wages in cash and is then immediately set upon by the other portions of the bourgeoisie, the landlord, the shopkeeper, the pawnbroker, etc.
Exploitation is not only about extracting surplus labor, but concerns the more general sense of using someone as a means (to her detriment and to one's own benefit).
Exploitation is any exchange in which the exploiter does better at the exploited party's expense, regardless of how voluntarily or mutually advantageous the arrangement.
Exploitation is a failure to distribute benefits and burdens within a relationship along a baseline or metric for the distribution of social surplus.
Exploitation is defined against domination and subjection. If exploitation asks who extracts the fruits of production from the producers, domination asks 'who controls whom.' Subjugation concerns a highly indirect application of force involving the constituting of a certain kind of subject through culture and power (or governmentality).