also: けんぼう
noun
The fundamental law of a state or political system, as in 日本国憲法. This is the main modern meaning.
日本国憲法は1947年に施行された。
The Constitution of Japan came into effect in 1947.
憲法改正について国会
Debate continues in the Diet over constitutional revision.
noun
rules; regulations; basic principles
Less common than the political sense; used for fundamental rules or governing principles of a group, household, or system, often with a slightly formal or figurative feel.
「食事中はスマホを見ない」が我が家の憲法だ。
"No looking at phones during meals" is the rule in our house.