also: ごはっと
noun
Often used with the honorific prefix ご (ご法度). Refers to something that is strictly forbidden, either by rule or social convention.
See also: ご法度
このエリアでは写真撮影はご法度です。
Photography is prohibited in this area.
彼の前でその話題はご法度だ。
That topic is taboo in front of him.
noun
Historical term for laws or ordinances, especially from the medieval period. Not used for modern laws.
中世には、幕府が様々な法度を発布した。
In the Middle Ages, the shogunate issued various ordinances.
禁止 is a general term for prohibition, often used in official rules and signs. 法度 (especially ご法度) carries a stronger sense of social taboo or strict ban, and is less formal than 禁止 in modern usage.
タブー is a loanword for taboo, often referring to cultural or social prohibitions. ご法度 can be used similarly but has a more traditional Japanese flavor.
Originally a term for laws and prohibitions in feudal Japan. The kanji 法 (law) and 度 (rule/measure) combine to mean 'legal prohibition'. The modern usage with ご is a polite form that softened into a general term for something forbidden.