(idiomatic) At the most extreme level; at full capacity.

(slang, idiomatic) An extreme level.

(idiomatic, chiefly US and Canada, of a person, chiefly in the negative) To behave in a manner suggesting that one is of normal intelligence, alert, and mentally stable.

The result of a calculation to estimate the effective size of a workforce that may include part-time workers.

(idiomatic, of a person) optimistic

A bullet having a complete covering of copper over the lead core. / The metal jacket itself, which covers the lead core.

plural of full metal jacket

A device used in some airports and train stations that creates an image of a person's naked body through their clothing to look for hidden objects without physically removing their clothes or making physical contact.

Alternative form of full speed ahead.

Alternative form of full speed ahead.