add.

To join or unite (e.g. one thing to another, or as several particulars) so as to increase the number, augment the quantity, or enlarge the magnitude, or so as to form into one aggregate.

To sum up; to put together mentally; to add up.

to add numbers

To combine elements of (something) into one quantity.

to add a column of numbers

To give by way of increased possession (to someone); to bestow (on).

To append (e.g. a statement); to say further information.

To intensify; to augment; to increase.

It adds to our anxiety.

To perform the arithmetical operation of addition.

He adds rapidly.

To summon minions or reinforcements.

Typically, a hostile mob will add whenever it's within the aggro radius of a player.

To add someone as a friend.

The addition of a song to a station's playlist.

An act or instance of adding.

An additional enemy that joins a fight after the primary target.

When the player has fought the boss for one minute, two adds will arrive from the back and must be dealt with.