verb
1.
to bring in or join on something more so as to form a larger or more inclusive whole
added music to his accomplishments
Synonyms: annex, append, subjoin, superadd, take on
Related Word: affix, attach, fasten, superimpose, tack (on); augment, enlarge, increase; burden, clutter, cumber, encumber, saddle
Contrasted words: abstract, detach; curtail, decrease, diminish, lessen, reduce
Antonyms: deduct, subtract
2.
to combine numbers or quantities into one sum
add up a column of figures
Synonyms: cast, figure, foot, sum, summate, tot, total, totalize, tote
Related Word: calculate, compute, estimate, reckon; score, tally