Step 1: Common misconceptions.
Liability is often confused with a right of the defendant or a specific criminal act, but neither is accurate.
Step 2: Correct legal meaning.
In law, liability means a legal responsibility or obligation imposed by law on a person or entity. It can arise from contracts, torts, statutes, or other legal sources.
Step 3: Scope.
Liability can be civil (e.g., paying damages) or criminal (e.g., punishment), but the core idea is always a legally enforceable obligation.
\[ \boxed{\text{a legal responsibility or obligation imposed by law}} \]