The headword is a feminine noun in the nominative singular; see LSJ s.v. It is extracted from Job 25.3 LXX (a phrase -- "respite for robbers" -- much quoted in Christian literature).
[1] The gloss is the same grammatical form as the headword, but it has other meanings, among them a putting over, transposition, excess, and (in the grammatical sense) superlative degree; see LSJ s.v. The headword is identically glossed in the Synagoge, Lexica Segueriana 332.11, and Photius, Lexicon pi375 Theodoridis; cf. Hesychius pi812.