(usually used in the plural) A weapon. / (in the plural) Heraldic bearings or insignia. / (in the plural, obsolete) War; hostilities; deeds or exploits of war.

(transitive) To supply with armour or (later especially) weapons.

The amount an arm or arms can hold.

weaponry, weapons

Third-person singular simple present indicative form of arm

plural of arm

Initialism of accelerated reply mail (a service of the United States Postal Service) / Initialism of adjustable rate mortgage.

(computing) Initialism of Acorn RISC Machine or Advanced RISC Machine.

present participle of arm

The act of supplying (oneself or others) with armor and (now especially) arms and ammunition in preparation for a conflict; the act of providing with the means of defense and attack.