Probably another form for palin (through the idea of retrocession); (adverbially) formerly, or (by relatively) sometime since; (elliptically as adjective) ancient -- any while, a great while ago, (of) old, in time past.
see GREEK palin
1. of old; Hebrews 1:1; (as adjective) former, 2 Peter 1:9. (πάλαι properly designates the past not like πρίν and πρότερον relatively, i. e. with a reference, more or less explicit, to some other time (whether past, present, or future), but simply and absolutely.)
2. long ago: Matthew 11:21; Luke 10:13; Jude 1:4; so also of time just past, Mark 15:44 (A. V. any while) (where L Tr text WH text ἤδη); 2 Corinthians 12:19 L T Tr WH (R. V. all this time) (so in Homer, Odyssey 20, 293; Josephus, Antiquities 14, 15, 4).