Assuming you mean fully vested in a retirement plan, you can have access to the entire amount. Vesting could be an employer scheduled contribution match that requires X amount of years to fully vest. Some insurance agents use the term in retirement annuities and life insurance in an attempt to address surrender charges.
Agent Owner, Gilmore Insurance Services, Marysville, Washington State
What does it mean to become fully vested in a retirement plan? What it pertains to is the percentage an employee gets from employer contributions to their retirement plan. Fully vested means that the employee now "owns" 100% of his/hers employer contributions to their retirement plans. The most common vesting schedule is a 5 year schedule that begins with 20% and finishes at 100%. Once at 100% with no breaks in service you stay at 100%. If an employee were to separate service after a year, they would take 100% of their contributions and only 20% of any employer matching.
Your vested portion can never be reduced.
If you leave your employer, the vested portion of your account can go with you or (in some cases) you can cash it out.