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