A promise, engagement, or stipulation. Each of the promises made by the parties to a contract, considered independently and not as mutual, may, in this sense, be denominated an “undertaking.” “Undertaking” is frequently used in the special sense of a promise given in the course of legal proceedings by a party or his counsel, generally as a condition to obtaining some concession from the court or the opposite party.

TLD Example: The president offered her personal undertaking to ensure her company would halt construction on its new factory under the lawsuit about its impact on the environment was resolved.

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