add

/ˈad/

Middle English adden, borrowed from Anglo-French adder, borrowed from Latin addere, from ad- ad--dere "to put, place," going back to a reduced ablaut grade of Indo-European *d{sup}h{/sup}eh-

verb

  1. to join or unite so as to bring about an increase or improvement

  2. to say further : append

  3. to combine (numbers) into an equivalent simple quantity or number

adds 60 acres to his land

abbreviation

  1. American Dialect Dictionary

  2. attention deficit disorder

adjective

  1. being or able to be added to and enclosed within an existing system (such as a computer)

add-in hardware