From Longman Dictionary of Contemporary Englishsplit secondˌsplit ˈsecond noun → a split second —split-second adjective It was a technique which required split-second timing.
Examples from the Corpus
split second• Unbelievably, for a split second, he was sure he saw a look of relief on the face of Nell Anderson.• For a split second, it took the oxygen out of the air.• For a split second, she struggled.• In a split second of surprised immobility, Grant saw the deadly muzzle come to bear on him.• Thus the advance is made a split second after discerning the opponent's attack.• A split second latter he claps his hand to his eye and wipes himself.• It occurred to him, in that split second, to let it fall. 