In order to provide income over the lifetime of the retiree, the TDF is designed to increasingly invest in deferred annuities as the TDF reaches its target retirement date and investors in the TDF get older.
Freebase(0.00 / 0 votes)Rate this definition: Echocardiography. Echocardiogram, often referred to cardiac echo or simply an echo is a sonogram of the heart. Echocardiography uses standard two-dimensional, three-dimensional, and Doppler ultrasound to create images of the heart.
Echocardiography is a test that uses sound waves to produce live images of your heart. The image is an echocardiogram. This test allows your doctor to monitor how your heart and its valves are functioning. An echocardiogram is key in determining the health of the heart muscle, especially after a heart attack.