Define the coupon rate on bonds. Is it a meaningful measure of the return on the bond?

Question:

Define the rate on bonds. Is it a meaningful measure of the return on the bond? Is there a more accurate measure?
Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...