This is the 1768th most frequent Russian word.
залпового
"Salvo" or "volley," often referring to simultaneous discharge or burst.
Here, 'залпового' refers to a type of fire (shot) that happens in a salvo, describing a type of military system.
Система залпового огня используется в военных целях.
The rocket salvo system is used for military purposes.
In this case, 'залпового' is used metaphorically to describe a sudden and simultaneous occurrence of laughter.
Залпового смеха было достаточно, чтобы успокоить напряжение.
A salvo of laughter was enough to ease the tension.
Here, 'залпового' again pertains to the act of launching things simultaneously, emphasizing anticipation.