Latensification, a portmanteau of latent and intensification, is the name given to uniformly post-exposing a photographic emulsion.
[1] The benefits of latensification are applicable in astrophotography - capturing images of stars.
However, many areas of the image would contain 'sub-latent' images, or areas of emulsion which have not received sufficient light to be exposed enough to show up.
If the film was post-exposed, the threshold point of exposure could be reduced, so these 'sub-latent' images could become visible.
In general photography, this process is often referred to as post-exposure (not to be confused with pre-flashing which happens before and even during the exposure).