Alan Day
Definition for 'Yes'. No specific Legal definition according to Dictionary.com - http://www.thefreedictionary.com/yes yes (ys) adv. It is so; as you say or ask. Used to express affirmation, agreement, positive confirmation, or consent. n. pl. yes·es 1. An affirmative or consenting reply. 2. An affirmative vote or voter. tr.v. yessed, yes·sing, yes·es To give an affirmative reply to. interj. Used to express great satisfaction, approval, or happiness.
Regular definition for cooperate. No specific Legal definition according to Dictionary.com. Just 'See these words' - http://www.thefreedictionary.com/cooperate
The third definition is interesting though
co·op·er·ate (k-p-rt) intr.v. co·op·er·at·ed, co·op·er·at·ing, co·op·er·ates 1. To work or act together toward a common end or purpose. 2. To acquiesce willingly; be compliant: asked the child to cooperate and go to bed. 3. To form an association for common, usually economic, benefit: When buyers cooperate, they can make large wholesale purchases at a discount.