col ‧ lec ‧ tive ‧ ly /kəˈlektɪvli/ BrE AmE adverb
[ Word Family: noun : ↑ collection , ↑ collector , ↑ collective , ↑ collectable , collectible, ↑ collectivism , ↑ collectivization ; adjective : ↑ collected , ↑ collective , ↑ collectable , collectible, ↑ collectivist ; verb : ↑ collect , ↑ collectivize ; adverb : ↑ collectively ]
as a group:
All members of the cabinet are collectively responsible for decisions taken.
Rain, snow, and hail are collectively known as precipitation.