The Collaborative International Dictionary of English v.0.48:

Add \Add\, v. t. [imp. & p. p. Added; p. pr. & vb. n.
   Adding.] [L. addere; ad + dare to give, put. Cf. Date,
   Do.]
   1. To give by way of increased possession (to any one); to
      bestow (on).
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            The Lord shall add to me another son. --Gen. xxx.
                                                  24.
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   2. To join or unite, as one thing to another, or as several
      particulars, so as to increase the number, augment the
      quantity, enlarge the magnitude, or so as to form into one
      aggregate. Hence: To sum up; to put together mentally; as,
      to add numbers; to add up a column.
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            Back to thy punishment,
            False fugitive, and to thy speed add wings.
                                                  --Milton.
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            As easily as he can add together the ideas of two
            days or two years.                    --Locke.
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   3. To append, as a statement; to say further.
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            He added that he would willingly consent to the
            entire abolition of the tax.          --Macaulay.
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   Syn: To Add, Join, Annex, Unite, Coalesce.

   Usage: We add by bringing things together so as to form a
          whole. We join by putting one thing to another in
          close or continuos connection. We annex by attaching
          some adjunct to a larger body. We unite by bringing
          things together so that their parts adhere or
          intermingle. Things coalesce by coming together or
          mingling so as to form one organization. To add
          quantities; to join houses; to annex territory; to
          unite kingdoms; to make parties coalesce.
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