What is meant by awareness-release, ...?

In "The Sublime Attitudes " the word "release" appears multiple times. What is meant by "awareness-release"? What is meant by "release of awareness"? Do both have the same meaning? Do they mean escape? As in, from becoming aware, I am released (from something). Do they mean potential attention (awareness), become manifest? Both, neither? Twice in the sutta the translator uses the phrase "no higher *release*" (without the word *awareness*). Is this significant? Help! :-)