to unite or join so as to increase the number, quantity, size, or importance

to add two cups of sugar; to add a postscript to her letter; to add insult to injury.

to find the sum of (often fol. by up )

Add this column of figures. Add up the grocery bills.

to say or write further.

to include (usually fol. by in )

Don't forget to add in the tip.

to perform the arithmetic operation of addition

children learning to add and subtract.

to be or serve as an addition (usually fol. by to )

His illness added to the family's troubles.

Journalism . copy added to a completed story. ?

add up to, to signify; indicate

The evidence adds up to a case of murder.

add up

to make the desired, expected, or correct total

These figures don't add up right.

to seem reasonable or consistent; be in harmony or accord

Some aspects of the story didn't add up.

verb

subtract , decrease , deduct , diminish , lessen , reduce , remove , withdraw , detract

verb

calculate , cast , compute , count , count up , do addition , enumerate , figure , reckon , reckon up , sum , summate , tally , tot , total , tote , tot upnotes:ad is short for advertisement while add means \'to join or unite\' so as to increase in size , quantity , quality , or scope , affix , annex , ante , append , augment , beef up * , boost , build up , charge up , continue , cue in , figure in , flesh out , heat up , hike , hike up , hitch on , hook on , hook up with , include , jack up , jazz up , join together , pad , parlay , piggyback , plug into , pour it on , reply , run up * , say further , slap on , snowball , soup up , speed up , spike , step up , supplement , sweeten * , tack on , tagnotes:ad is short for advertisement while add means \'to join or unite\' so as to increase in size , foot , totalize , add , addend , adjoin , aggrandize , amplify , attach , combine , complement , compound , connect , elaborate , enhance , expand , extend , foot up , fuse , grow , increase , inflate , intensify , introduce , join , magnify , plus , protract , strengthen , subjoin , suffix , sum up , superadd , superimpose , widen