Solution to M: Exhibit 0 Meta

Answering each of the puzzles in this exhibit gives the following four sets of words:
behind prey short through
concept house mind source
clean dock run spell
balance guard limits site

The key words in the hint for the meta are before and after.
"Fall" can come before each word in the first set of words, "Open" before each in the second, "Dry" before each in the third, and "Off" before each in the fourth. We now look for a word that can come after each of these four new words: Season 


SEASON