A testamentary disposition subsequent to a will, and by which the will is altered, explained, added to, subtracted from, or confirmed by way of republication , but in no case totally revoked. Lamb v. Lamb, 11 Pick. (Mass.) 370; Dunham v. Averill, 45 Conn. 70, 20 Am. Rep. 042; Green v. Lane, 45 N. C. 113; Grimball v. Patton, 70 Ala. 031; Proctor v. Clarke, 3 Redf. Sur. (N. Y.) 448. A codicil is an addition or supplement to a will, either to add to, take from, or alter the provisions of the will. It must be executed with the same formality as a will, and, when admitted to probate, forms a part of the will. Code Ga. 18S2,