Antonym: subtraction. Similar words: in addition, additional, in addition to, edition, condition, tradition, expedition, conditions. Meaning: [ə'dɪʃn] 
n. 1. a component that is added to something to improve it 2. the act of adding one thing to another 3. a quantity that is added 4. something added to what you already have 5. a suburban area laid out in streets and lots for a future residential area 6. the arithmetic operation of summing; calculating the sum of two or more numbers.
n. 1. a component that is added to something to improve it 2. the act of adding one thing to another 3. a quantity that is added 4. something added to what you already have 5. a suburban area laid out in streets and lots for a future residential area 6. the arithmetic operation of summing; calculating the sum of two or more numbers. 
Random good picture Not show
1, Our baby brother is an addition to our family.
2, In addition to endure, we have no choice.
3, I minored in literature in addition to art.
4, To accomplish great things, in addition to dream, must act.
5, Such an outfit would be a useful addition to my wardrobe.
6, The company provides cheap Internet access. In addition, it makes shareware freely available.
7, In addition to the thick fog(sentencedict.com), there was a heavy swell.
8, In addition to the 81 positive comments, 26 students had neutral, mixed, negative or off topic views.
9, Use a good waterproof adhesive in addition to the screws.
10, In addition to the photos, nothing taken away; In addition to the footprints, nothing left.
11, In addition to you,and who is eligible walked around in my heart.
12, Part-time English classes are offered. In addition, students can take classes in word-processing and computing.
13, There will be simple tests in addition, subtraction, multiplication and division.
14, They nobbled two children as hostages in addition.
15, You do that in addition?
16, She gets various perquisites in addition to her wages.
17, Multiplication and addition are associative operations.
18, In addition there are six other applicants.
19, He worked it out through simple addition.
20, She's ready to learn simple addition and subtraction.
21, Addition, subtraction, multiplication,[http://sentencedict.com/addition.html] and division are binary operations.
22, That is a simple addition.
23, There is, in addition, one further point to make.
24, Addition and division are forms of computation.
25, They've just had an addition to the family.
26, The addition of networking facilities will greatly enhance the system.
27, Since you left crushing the dream with, then I choose in perishing in addition.
28, She's young and dynamic and will be a great addition to the team.
29, The final chapter is no more than a scrappy addition.
30, Pasta's basic ingredients are flour and water, sometimes with the addition of eggs or oil.
More similar words: in addition, additional, in addition to, edition, condition, tradition, expedition, conditions, traditional, traditionally, position, munitions, coalition, composition, exhibition, opposition, definition, transition, acquisition, recognition, practitioner, add in, ambitious, notion, nation, action, option, motion, portion, question.