Agency (n.) is a phenomenon limited to those instances where there is a selection between culturally determined predefined choices (i.e. Chocolate or vanilla).
Agency (n.) is always confined to the constraints of the habitus which embodies the history of the group or class to which the agent belongs.
Agency (n.) is constrained on the one hand by ingrained dispositions (which constrain understanding) and on the other, by social or material capital (which constrain the sphere of possibility).
Agency (n.) is not at all the same as free will insofar as it is deeply imbued with, and patterned by habitus... that is, the notion that you know what you are supposed to do and not supposed to do without even the need for anyone to explain it.
Agency (n.) is something one negotiates vis-a-vis the social and cultural structures of society.
Agency (n.) is the idea that men are like cardplayers, seizing chances in the flow of the game, often through intuition as much as reason.
Agency (n.) is the idea that, in a card game, while the prior distribution of the cards sets limits, a good player can squeeze out extra tricks from quite unpromising hands.
Agency (n.) is when a rule plays a role in the production of the action, by making it sensitive to the possibility of mistake.