re·di·al 
(r
ēd
ī′əl, -d
īl
′)
v. re·di·aled, re·di·al·ing, re·di·als or re·di·alled or re·di·al·ling
v.tr. To place a telephone call to (a telephone number or a person) by dialing the number again, typically by pressing a designated button.
v.intr. To redial a telephone number.
n. A function on a telephone that allows one to place a call to the most recently dialed number by pressing a designated button.