What is a well regulated milita?

The Second Amendment of the United States Constitution reads: "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

What does this mean?  I have no idea but I think it is an amendment that has outlived its time and should be repealed--I don't expect a British soldier to come beating on my door! Does it mean that every Tom, Dick and Harriet should have all the guns they want--assault rifles etc.   I don't think it does.  Other countries seem to get along just fine without having guns rampant in the society.  Australia bought back guns and has had very few mass shooting after that.  Look at the number of gun deaths in the U.S. from the CDC.  And a number of these are children, some accidental, some not.

All firearm deaths in the U.S.

• Number of deaths: 33,636
• Deaths per 100,000 population: 10.6

I don't have a problem with hunters having a licensed firearm but we are overrun with guns and we are paying the price for it.  We need common sense gun control.