A firearm that has ammunition loaded into it.
IMPROVING ANSWER: If you say "a gun is loaded when there is ammo inside it" you are using common sense. If you are asking the question about gun safety and safe gun handling, that's totally accurate. An "unloaded" gun means one that is fully unloaded-- no ammo in any part of it, even the magazine.
But from a legal standpoint, if you are carrying a gun in a way that is only legal if the gun is not loaded, watch out for what your state's legal definition of a "loaded" gun is. Not all state and local laws are written with common sense.
Sometimes, in some jurisdictions, the law might use the phrase "loaded firearm" to mean a gun that is NOT actually loaded, but for which there is ammunition within easy reach, if the gun and the ammo are not in cases or boxes. And in some jurisdictions, a gun that has rounds in the magazine but none in the chamber might or might not be "loaded" in the eyes of the law. So really, it depends on what state you're in and what the circumstances are.
In reference to a firearm, a firearm is considered loaded when there is a live round of ammunition "...in, or attached in any manner to, the firearm, including, but not limited to, in the firing chamber, magazine, or clip thereof attached to the firearm..."
If there is ammunition in the magazine or cylinder, the firearm is loaded.
Depends on the laws where you are- and you did not give a location. In most US states, when hunting, you may not carry a loaded firearm on an ATV or snowmobile.
Not enough details to answer your question. If you're carrying a loaded firearm in a legal manner, and in legal possession of it, there'd be no charge.
Ensure that the firearm is not loaded: check the chamber, magazine well, etc....
It's because it would be equivalent to having a loaded firearm during transport and when law enforcement see that you have a loaded firearm (according to NY firearm laws), they may have the right to arrest you.
powder,ball and capped
Treat every firearm as if it is loaded
Consider every gun loaded
Having a magazine in a firearm can mean that the firearm is loaded, and ready for use (if a cartridge has been chambered). If it is not loaded, it takes longer to put it in a condition that it can be fired.
Cartridges are loaded into a magazine. In the case of a single shot firearm, they are loaded directly into the chamber.
Treat all weapons as if they are loaded.