Add \Add\, v. i.

1. To make an addition. To add to, to augment; to increase; as, it adds to our anxiety. ``I will add to your yoke.'' --1 Kings xii. 14.

2. To perform the arithmetical operation of addition; as, he adds rapidly.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Add \Add\, v. t. [imp. & p. p. Added; p. pr. & vb. n. Adding.]

[L. addere; ad + dare to give, put. Cf. Date, Do.]

1. To give by way of increased possession (to any one); to bestow (on).

The Lord shall add to me another son. --Gen. xxx. 24.

Source: Webster's Revised Unabridged Dictionary (1913)