Part of a sum, in math

• Arithmetic figure
• Sum thing
• A number that is added to another number (the augend)
• Portion of a sum
• Number on either side of a +
• Number in a sum
• Summed thing
• Quantity to be appended

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] ||

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