How do you spell Alter

Available Definitions:
1)  v. t. - To make otherwise; to change in some respect, either partially or wholly; to vary; to modify.
2)  v. t. - To agitate; to affect mentally.
3)  v. t. - To geld.
4)  v. i. - To become, in some respects, different; to vary; to change; as, the weather alters almost daily; rocks or minerals alter by exposure.