What defines an at-will employee?

An at-will employee is defined as someone who can quit or be terminated for any reason at any time. This employment arrangement means that either the employer or the employee can end the employment relationship without cause, provided that the termination does not violate existing laws or contractual obligations. This reflects the principle of at-will employment, which is common in many jurisdictions, allowing for flexibility for both parties.

Other definitions provided in the options refer to specific circumstances that do not align with the at-will employment doctrine. For instance, being fired for cause implies a necessity for a legitimate reason for termination, which contradicts the at-will principle. Similarly, an employee bound by a contract with a specified end date has a defined employment relationship that is not typical of at-will employment, as it generally involves a clear timeframe and grounds for termination. Lastly, union membership can influence terms of employment but does not define at-will status, as unionized positions often have collective bargaining agreements that outline specific conditions for termination and job security. Thus, the choice clearly capturing the essence of at-will employment is the one stating that an employee can quit or be terminated for any reason at any time.