Definitions from Wiktionary ( )

▸ verb:  (transitive) 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.
▸ verb:  To sum up; to put together mentally; to add up.
▸ verb:  (transitive) To combine elements of (something) into one quantity.
▸ verb:  (transitive) To give by way of increased possession (to someone); to bestow (on).
▸ verb:  (transitive) To append (e.g. a statement); to say further information; to add on.
▸ verb:  (intransitive) To make an addition; to augment; to increase; to add on.
▸ verb:  (intransitive, mathematics) To perform the arithmetical operation of addition.
▸ verb:  (intransitive, video games) To summon minions or reinforcements.
▸ verb:  (transitive, Internet, text messaging, video games) To add someone as a friend.
▸ noun:  (radio) The addition of a song to a station's playlist.
▸ noun:  (computer science) An act or instance of adding.
▸ noun:  (video games) An additional enemy that joins a fight after the primary target.
▸ noun:  A designation on prerecorded compact discs indicating that the contents were recorded in analog but mixed and mastered in digital; compare AAD, DAD, DDD.
▸ noun:  Initialism of attention deficit disorder. [A syndrome formerly thought to affect children only, but now known also to affect adults, that is characterized by frequent, chronic distractibility, and either inattentiveness or hyperactivity (fidgeting).]
▸ noun:  Initialism of accidental death and dismemberment.

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