From Longman Dictionary of Contemporary Englishreactionsreactions[plural]REACT your ability to move quickly when something dangerous happens suddenly a skilled driver with very quick reactions → reaction
Examples from the Corpus
quick reactions• And the quick reactions necessary in battle make the soldier speed past so much texture, detail.• To deal with the signals produced by these sense organs they have considerable brains and very quick reactions.• He may well be a skilled driver with quick reactions, but he will deliberately take risks. 