noun
a supplement or addition to a will, which may modify, add to, subtract from, or revoke provisions in the will
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The lawyer drafted a codicil to amend the terms of the will.
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He added a codicil to the will to make sure his daughter received the family heirlooms.
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I had to sneak a codicil into the will to make sure my brother didn't get everything.
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Adding a codicil to the plan helped improve its overall effectiveness.