addition, edition

Addition or addition ( add ih shun ) means what happens in elementary school math class-
The children are learning addition and subtraction.
I added it up again and got a different answer. I must have made a mistake in the addition.
Addition also means something extra, or something included after an initial list or count--
There will be an addition to the program.
We can stop at the discount store, in addition to the errands we planned.
Addition also means "as well as", particularly in the phrase "in addition to"--
We will be discussing employee benefits in addition to the regular program.
He had to pay court costs, in addition to the fine for his driving citation.
An "addition" means a room or rooms added to an existing house or building--
They took out a second mortgage to put an addition on the house.
Their family was too big for the house, so they built an addition.

Edition or edition ( ed ih shun ) means an issue of a book, newspaper or other publication--
We are using the 1983 edition.
Go out and see if there's an evening edition of the paper.
Edition may also mean a version or "retelling" of a  story--
The revised edition of the story left out the part about the candidate.

Now that you know that, you can say--
"He wants to buy the illustrated edition, in addition to the paperback."

Note--not to be confused with "audition", meaning a try-out for a film or stage part, or some other job--
The actress was nervous during the audition,. but she got the part.
The singer was scheduled for an audition with a record producer.