Here is the meaning of the word, ALTER

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