Kill 12k minions as a team?

Alright, so I'm looking for some answers on this since I am somewhat confused. Does "as a team" refer to minions you slay together, such as in the late game when all 5 players go on a lane, or does it actually count all the minions your team kills in a game, whether it's solo or together? Asking because I went in ARAM thinking I would do it faster since I believed it was the first thing, but I think I got more minions from a Summoners rift game? I am not sure, so I came to ask what is it.
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