An alternate way to perform the same or similar attack (e.g. light and heavy punch), without being entirely different attack on its own (e.g. kick and punch).
Alternate names: Alternate fire mode
Name variations: alt fire, altfire
The first video game about Alternate attack was released in 1987.
Note that this is alternate attack with the same thing, not alternate attack with something else.
So player having a punch attack and kick attack do not count. Player having a light punch and heavy punch would.
Commonly the alternate attack is more powerful but slower, has fewer ammo, may be potentially harmful for the player and so forth.
* Primary attack is weak punch/kick, alt attack is heavy punch/kick
* Short zap with a laser (pulsed), alt attack is constant burn beam
* Combo weapons: although alt-fire is often the key called when firing the secondary weapon, this is not really alt fire any more than wielding two pistols and claiming the second pistol is alt fire.