1 To make otherwise; to change in some respect, either partially or wholly; to vary; to modify. “To alter the king’s course.” “To alter the condition of a man.” “No power in Venice can alter a decree.” Shak. It gilds all objects, but it alters none. Pope. My covenant will I not break, nor alter the thing that is gone out of my lips. Ps. lxxxix. 34.
2 To agitate; to affect mentally. [Obs.] Milton.
3 To geld. [Colloq.]
To become, in some respects, different; to vary; to change; as, the weather alters almost daily; rocks or minerals alter by exposure. “The law of the Medes and Persians, which altereth not.” Dan. vi. 8.