Can I use lookup function to get a value from one dataset?

Hello, have one dataset with two columns, code and meaning.  I have the code value and like to extract the meaning from dataset.  I was looking at lookup function but it looks like I have to have two datasets and a common key between them.

Code                      meaning

1                            description for one

2                            description for two

Like to pass 2 and get description for two

Thanks again