Definition for Planck Era
From Biology Forums Dictionary
The Planck Era is prior to 10-43 s after the Big Bang, when we believe that the four basic forces of nature, 1) gravity, 2) nuclear strong force, 3) nuclear weak force, and 4) electromagnetic force were combined into a single "super" force. The idea is somewhat like the different phases of water (ice, liquid, and vapor), which are all aspects of the same thing.