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.
Ordinance, on the other hand, is an Ad hoc Act in the sense that the Head of State implements it on the advice of the cabinet or an executive body. An ordinance has a limited life (like 6 months, in India) unless it is passed by the legislature concerned as an Act.