addition

/əˈdɪʃən/
noun
  1. The process of adding numbers or quantities together.
    • She solved the addition problem quickly in her head.
    • Learning addition is one of the first math skills children develop.
    • The total cost was found by simple addition of all the items.
  2. A person or thing that is added to something else.
    • This software is a useful addition to our toolkit.
    • The new library is a welcome addition to the neighborhood.
    • We are expecting an addition to our family next month.
  3. The act of adding something to something else.
    • The addition of extra sugar changed the taste of the recipe.
    • The company announced the addition of two new products to its line.
    • With the addition of a few more chairs, the room can hold everyone.
Synonyms
What does "addition" mean? | whatsthatwordmean | whatsthatwordmean