Mich. Comp. Laws § 445.271: Definitions.

Sec. 1.

As used in this act:

"Adverse information" means information indicating that the cosigner has not complied with the contractual provisions of an obligation.

"Collection action" means requesting a cosigner to pay all or part of the obligation.

"Cosigner" means a natural person who renders himself or herself liable for the obligation of another person without compensation. The term includes a person whose signature is requested as a condition to granting credit to another person, or as a condition for forbearance on collection of another person's obligation that is in default. The term does not include a spouse whose signature is required on a credit obligation to perfect a security interest under state law, or a person who has executed a guarantee. A person who does not receive goods, services, or money in return for a credit obligation does not receive compensation within the meaning of this definition. A person is a cosigner within the meaning of this act whether or not he or she is designated as a cosigner on a credit obligation.

"Obligation" means an indebtedness incurred by an individual for personal, family, or household purposes.

"Person" means an individual, firm, partnership, association, or corporation.

"Primary obligor" means a person, other than a cosigner, who signs an obligation as a debtor.