de ‧ cid ‧ er /dɪˈsaɪdə $ -ər/ BrE AmE noun [countable usually singular]
the last part of a game or competition, which will show who the winner is:
This next round will be the decider.
de ‧ cid ‧ er /dɪˈsaɪdə $ -ər/ BrE AmE noun [countable usually singular]
the last part of a game or competition, which will show who the winner is:
This next round will be the decider.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012