A legal doctrine allowing either employer or employee to terminate the employment relationship at any time, for any reason, or for no reason at all, without warning or cause. This principle governs most employment relationships in the United States, though it has exceptions for illegal discrimination or retaliation.
Developed in 19th-century American common law, codified in Horace Wood's 1877 treatise 'Master and Servant.' The doctrine emerged during industrialization as courts moved away from English precedents that assumed indefinite employment terms, reflecting American emphasis on contractual freedom and economic mobility.
Most Americans don't realize they can be fired for wearing the wrong color shirt, liking the wrong sports team, or literally no reason at all! The 'at will' doctrine makes the US unique among developed nations—most other countries require 'just cause' for termination.
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