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.