Certain number or quantity

• Sum component
• It's close to a plus
• This helps to form a sum
• Portion of a sum
• Number on either side of a +
• 1 or 2, in 1 + 2
• Figure in a sum
• Part of the total
• Number on either side of a plus sign

WordNet Word definitions in WordNet
n. a number that is added to another number (the augend)