v (transitive) To give by way of increased possession (to any one); to bestow (on).
v (transitive) To join or unite, as 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. Hence: To sum up; to put together mentally.
v (transitive) To combine elements of (something) into one quantity.
v (transitive) To append, as a statement; to say further.
v (intransitive) To make an addition. To add to, to augment; to increase.
v (intransitive|mathematics) To perform the arithmetical operation of addition.
n (video games) An additional enemy that joined the fight after the primary target.
n (computer science) An act or instance of adding.