NRS 357.024: “Obligation” defined.

“Obligation” means any established duty, regardless of whether the duty is a fixed duty, arising from:

1. An express or implied contractual relationship;

2. A relationship between a grantor and a grantee;

3. A relationship between a licensor and a licensee;

4. A fee-based or similar relationship;

5. A statute or regulation; or

6. The retention of any overpayment.