Definitions for "At will employment"
A provision found in many employment contracts which suggests the employee works at the will of the employer, and which the employers insert in order to avoid claims of termination in breach of contract, breach of the covenant of good faith and fair dealing, or discrimination. Inclusion of such a term puts the burden on the discharged employee to show that he or she had reasons to believe the employment was permanent. The employer uses the "at will" provision to claim: We could fire the employee at any time, no matter what the reasons. (http://dictionary.law.com)
Gives employers the right to fire employees at will and for no reason at all.
An employment relationship where there is no contractual agreement or obligation, and an employer is free to fire an employee for any reason or no reason, and the employee is free to quit at any time.