What is Universal Life Insurance?

Legal Definition
Universal life insurance (often shortened to UL) is a type of cash value life insurance, primarily in the United States of America. Under the terms of the policy, the excess of premium payments above the current cost of insurance is credited to the cash value of the policy. The cash value is credited each month with interest, and the policy is debited each month by a cost of insurance (COI) charge, as well as any other policy charges and fees drawn from the cash value, even if no premium payment is made that month. Interest credited to the account is determined by the insurer, but has a contractual minimum rate (often 2%). When an earnings rate is pegged to a financial index such as a stock, bond or other interest rate index, the policy is an "Indexed Universal Life" contract. These types of policies offer the advantage of guaranteed level premiums throughout the insured's lifetime at substantially lower premium cost than an equivalent whole life policy at first; the cost of insurance is always increasing as found on the cost index table (usually p. 3 of a contract). This not only allows for easy comparison of costs between carriers, but also works well in irrevocable life insurance trusts (ILIT's) since cash is of no consequence.
-- Wikipedia
Legal Definition
A form of life insurance that offers flexible premiums, adjustable death benefits, and the ability of the insured to make partial withdrawals from the cash value. Universal life insurance policies generate cash value as the insured’s premium payments are invested into the insurer’s investment fund. The insurer pays the interest at a rate that is competitive with other investments, such as treasury bills, and the insured may use that interest to pay for his or her life insurance premiums.
Legal Definition
US life insurance combining adjustable benefits with adjustable premiums.