splitsecond
nounUK /ˌsplɪt ˈsek.ənd/
US /ˌsplɪt ˈsek.ənd/
A splitsecond is a very, very short moment of time.
The lightning flashed and, in a splitsecond, the whole sky turned bright.
OTHER MEANINGS
2. An extremely brief period used to describe something happening almost instantly.
The race was decided in a splitsecond at the finish line.
3. A tiny fraction of a second, too short to measure easily.
The camera can capture a splitsecond of a hummingbird's wing.
4. A very short amount of time in which a quick decision is made.
She had only a splitsecond to choose which way to jump.