Quantity to be appended

• The 3 or 5 in 3 + 5 = 8
• Portion of a sum
• Number next to a plus sign
• 1 or 2, in 1 + 2
• Number on either side of a plus sign
• Sum component
• Figure in a sum
• Number next to a +

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
addend \addend\ n. 1. a number that is added to another number. [WordNet 1.5] ||