noun
something that tends to increase something else (as in size, number, or content)
there are several new additions to our staff
Synonyms: accession, accretion, augmentation, increase, increment, raise, rise
Related Word: accessory, adjunct, appanage, appurtenance, supplement; continuation, extension, rider; accrual, accruement, accumulation
Contrasted words: deduction, lessening, reduction