Definitions for "Planck time"
Keywords:  gravity, spacetime, bang, max, photon
the first 10–43 seconds of the Universe when time as humans recognize it did not exist because gravity, which defines spacetime, had not yet split from the other forces; instead, a time system that allowed more than one object to occupy the same space was in operation (see singularity)
A quantity associated with quantum gravity. It is the time it takes for light to travel a Planck length interval which is about 10-34 seconds.
the smallest measurable unit of time. 1.3 x 10-43 seconds.