adjective
[ only before noun ] done very quickly or very accurately :
She had to make a split-second decision.
The success of the raid depended on split-second timing .
adjective
[ only before noun ] done very quickly or very accurately :
She had to make a split-second decision.
The success of the raid depended on split-second timing .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005