How would you interpret what work should be performed if the following is added to a contract?

"Seller is to Finish basement walls and ceiling with drywall"

I'd say that you need to get sheet rock (drywall) and finish out the basement. In other words, the walls in the basement should look like the walls in the main areas of the house.

That is pretty vague.  It could mean that the seller will simply put up drywall on the current walls and ceiling without any other finishing (mud & taping, painting, etc).  If I were the buyer, I would assume this to be the case as it does not specify anything else.

Are you on the buying side or the selling side?

Thanks for the perspectives.  The term "Finish" is the sticking point here, common homebuilder terms would lead one to think that if it was only drywall then it would be said "hang drywall" and if it refers to framing and drywall the term would be "Finish a wall".  "Finish" often times refers to "finished square feet" meaning that electrical must be ran within this area of the home.  Trying to understand all perspectives to make the best decisions possible.  Correct me if I'm wrong. 

If you're worried about how the language will be interpreted, then ask the other party how they intend to handle the repairs.  If you're not happy with their answer, then add an addendum to the contract to spell out exactly what you'd like to have done. 

With it being so vague, you won't have a leg to stand on if you want to hold them to how it's orginally written, since "finished" has many different definitions as you had mentioned, it just depends on who you're talking to.

The problem is that if this were to go to trial, the determination would be from a judge or jury, not a contractor or homebuilder.  It is best to specify what is meant by the generic term in order to protect everyone involved.

Thank you all for your input.  I appreciate the help.  At the time the contract was drawn it seemed clear based upon the sellers listing as to what we meant when we said "Finish" but has become an issue that we are trying to sort through.

I understand this to mean that the seller is to finish basement walls and ceiling equivalent to what's in the rest of the house (maybe with the exclusion of paint)