Law determining the fundamental political principles of a government(noun)
WordNet. Princeton University. 2010.
Use "fundamental law" in a sentence
"Perpetuity is implied, if not expressed, in the fundamental law of all National Governments."
"The people of that country having never been in the habit of self-government, are not yet in the habit of acknoleging that fundamental law of nature, by which alone self government can be exercised by a society, I mean the lex majoris partis."
"Hardly any kind of Hebrew poesy is absent; epithalamia and lamentations; little satirical songs; odes of wonderful lyrism etc. The fundamental law of Hebrew poetry, the parallelism of the stichs, is usually observed."