To scientists, a theory is an explanation of some feature of the world that meets three requirements: it is supported by evidence, is testable and falsifiable, and can be used to make predictions. As the first requirement shows, âtheoryâ in scientific use does not mean âguessâ or anything similar.
Look up ordinance in Wiktionary, the free dictionary. A local ordinance is a law usually found in a code of laws for a political division smaller than a state or nation, i.e., a local government such as a municipality, county, parish, prefecture, etc. 1  1 United States.  1.1 Alabama.
As a result, city and state governments are developing noise ordinances. Noise ordinances are laws which limit the allowable noise level(s) at different times of day for different zoned areas (i.e. residential, commercial, industrial). The maximum allowable noise levels are typically higher during daytime hours and lower during nighttime hours.