Used as an adjectival noun (na-adjective) to describe something of decisive importance, a critical situation, or a crucial point. Often seen in formal or technical contexts.
The success of this project is a critical factor.
Abbreviation of クリティカルヒット, used in video games for a hit that deals extra damage. Primarily a gaming term.
See also: クリティカルヒット
I landed a critical hit on the boss and defeated it in one blow.
This bug is critical to the system.
I got lucky and landed a critical hit.
The match reached a critical turning point.
mission-critical