stipulation

noun

• The act of stipulating; a contracting or bargaining; an agreement.
• Something that is stated or stipulated as a condition of an agreement.

  "If I lend you my car, my only stipulation is that you fill up the gas tank before returning it."

• The situation, arrangement, and structure of the stipules.
• A goal to be achieved in a chess problem; for example, to checkmate Black within a specified number of moves.