Legal Definition of Custom: An oft-repeated mode of conduct; a form of behavior acceptable to the majority of society, such as working five or six days a week. A custom, by its universal adoption and repetition, acquires the importance and effect of a law in a particular community or country | Discover the power of customs in shaping societal norms and expectations. Learn how understanding and respecting customs can enhance your business reputation. Explore practical examples and gain insight into the legal definition of custom