Armed means carrying weapons or equipped with tools for fighting. A soldier is armed when carrying a rifle, and police officers are armed when they carry firearms as part of their duty. Knights in medieval times were armed with swords and lances.

Someone can also be armed with non-weapon items that help them succeed. A student might go into a debate armed with facts and statistics. A scientist enters the laboratory armed with knowledge from years of study. In this sense, being armed means having what you need to handle a challenge.

The word appears in important phrases like “armed forces” (a nation's military) and “armed robbery” (stealing while carrying a weapon, which is treated as a much more serious crime than regular theft). The opposite is unarmed, meaning without weapons. This distinction matters in law and in discussions about safety and conflict.

You might hear about nations in an “arms race,” competing to build more powerful weapons, or about “arms control,” which refers to agreements between countries to limit weapons. The phrase “up in arms” means very angry and ready to fight or protest, though not necessarily with actual weapons.

As a verb, to arm means to provide someone with weapons or to prepare them for a challenge, as in “The guards armed themselves” or “She armed herself with patience.”