A traditional IRA is what is considered a "qualified" account. In essence, this means that the account gets special tax treatment---in particular, allowing you to defer taxation until a later date. With these types of accounts, you do not have to withdraw the money all at once. Many advisors refer to this as allowing you to "stretch" the distributions over time. Ultimately, this allows you to reduce income taxes which you must pay.
One definition of "disclaim" is when a person denies or renounces a claim to some thing or some right. In the context of estate administration, when a person disclaims, they are renouncing part or all of their right to receive under a Will, Trust or by operation of law.