"Will vest" is a legal term that describes when a beneficiary's right to an asset or benefit becomes certain and irrevocable. This means that the beneficiary has a guaranteed claim to the asset, although they may not receive it immediately. Vesting often occurs after a specific period of time, meeting certain conditions, or upon the occurrence of a particular event. For example, employee stock options typically vest after a certain number of years of service. Once vested, the beneficiary has a legal right to the asset or benefit, even if they leave the company or the original grantor of the benefit dies.