the organization that is the governing authority of a political unit
"the government reduced taxes"
"the matter was referred to higher authorities"
Mode of rule or management.
"The new environmental regime implemented stricter penalties for companies that exceeded their carbon emissions limits."
In plain English: A regime is a government or the system of rules that controls a country.
"The new sports regime helped him lose weight quickly."
Usage: Use regime to refer specifically to an authoritarian government, whereas system describes any method of organization without political connotations. Avoid confusing it with regimen, which refers strictly to a prescribed course of diet or exercise for health purposes.
The word regime entered English from the Middle French form regime, which originally meant "direction" or "government." It is a doublet of the Latin word regimen, sharing the same root and core meaning.