Origin: Latin suffix -al
Arsenal has 5 different meanings across 2 categories:
a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms
"The soldiers marched into the old fortress to inspect the arsenal, where they found crates of rifles and spent hours practicing their marksmanship."
A military establishment for the storing, development, manufacturing, testing, or repairing of arms, ammunition, and other war materiel; an armoury.
"The government allocated billions to upgrade the national arsenal so it could manufacture enough modern weaponry for defense."
In plain English: An arsenal is a large place where weapons and ammunition are stored for an army to use.
"The company decided to expand its arsenal of security tools to protect against new cyber threats."
Usage: While often used metaphorically to describe any large collection of tools or skills, this word specifically refers to a facility where weapons are manufactured or maintained rather than just stored. Use it when discussing military logistics or sports teams' collections of players and tactics, but avoid confusing the physical location with the general concept of an armory.
The Arsenal football club.
"Arsenal secured their place in the final after a thrilling victory over Manchester United."
From Italian arsenale, from Arabic دَار الصِّنَاعَة (dār aṣ-ṣināʕa, "manufacturing shop"), from دَار (dār) + صِنَاعَة (ṣināʕa).