If you want the dictionary definition, just double click on any word.

Decision is a noun

It can be used to describe a conclusion or resolution reached after consideration.

For example:-

There are many decisions we have to make before we choose a new word for this section of the website.

It can also be used to describe the action or process of deciding something or of resolving a question

For example:

After a long discussion we made the decision to close the forum, because it had been badly spammed.

Divison is also a noun with more than one meaning.

It can describe the action of separating something into parts, or the process of being separated.

For example:-

 The division of the country caused new problems.

It is also used in mathematics.

For example:

 In elementary maths division (÷ or /) is an arithmetic operation.

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