add

Etymology

From Middle English adden, from Latin addō (“add, give unto”), from ad (“to”) + dō (“give”).

verb

1. (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.
2. To sum up; to put together mentally; to add up.
   to add numbers
3. (transitive) To combine elements of (something) into one quantity.
   to add a column of numbers
4. (transitive) To give by way of increased possession (to someone); to bestow (on).
5. (transitive) To append (e.g. a statement); to say further information; to add on.
6. (intransitive) To make an addition; to augment; to increase; to add on.
   It adds to our anxiety.
   Mostly, the microbiome is beneficial.[…]Research over the past few years, however, has implicated it in diseases from atherosclerosis to asthma to autism. Dr Yoshimoto and his colleagues would like to add liver cancer to that list. 2013-06-29, “A punch in the gut”, in The Economist, volume 407, number 8842, pages 72–3
7. (intransitive, mathematics) To perform the arithmetical operation of addition.
   He adds rapidly.
8. (intransitive, video games) To summon minions or reinforcements.
   Typically, a hostile mob will add whenever it's within the aggro radius of a player.

noun

1. (radio) The addition of a song to a station's playlist.
   In a typical week, 10 to 15 songs may be up for consideration as “adds” of new songs for the station's playlist. 2006, David Baskerville, Music Business Handbook and Career Guide, page 370
   Effectiveness of their work is measured by the number of “adds” they receive on the airplay charts of major trades. 2013, Russ Hepworth-Sawyer, From Demo to Delivery
2. (computer science) An act or instance of adding.
   List the number of adds and multiplies for each of the forms (6) , (7), and (8). 2004, C. K. Birdsall, A. B. Langdon, Plasma Physics via Computer Simulation, page 75
3. (video games) 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.