What does decompison mean?

"Decompison" is not a recognized word in the English language. It seems like a possible misspelling of "decomposition," which refers to the process of breaking down a substance into simpler components.

Here are some possible scenarios:

* Typo: You may have accidentally typed the wrong letters.

* Technical Term: It could be a technical term used in a specific field (e.g., chemistry, biology) that isn't widely known.

* Made-up Word: It could be a word made up for a specific purpose or context.

If you can provide more context about where you encountered this word, I may be able to give a more specific answer.