Sure! Let's break down the word "ordnance" in a way that's easy to understand.
Ordnance (noun) refers to large military weapons and equipment, such as guns, missiles, and ammunition. It can also mean the supplies that are needed for military operations, like bombs and artillery.
In summary, "ordnance" is a specialized term used mainly in military contexts to refer to large weapons and supplies. It’s important to use it when discussing military matters, and you won't find it used much outside of those discussions.