Adverb from perissoteros; more superabundantly -- more abundant(-ly), X the more earnest, (more) exceedingly, more frequent, much more, the rather.
see GREEK perissoteros
1. properly, more abundantly (so in Diodorus 13, 108; Athen. 5, p. 192 f.); in the N. T. more, in a greater degree; more earnestly, more exceedingly, (cf. Winer's Grammar, 243 (228)): Mark 15:14 Rec.; 2 Corinthians 7:15; 2 Corinthians 11:23; Galatians 1:14; Philippians 1:14; 1 Thessalonians 2:17; Hebrews 2:1; Hebrews 13:19; opposed to ἧττον, 2 Corinthians 12:15; περισσοτέρως μᾶλλον, much more (R. V. the more exceedingly), 2 Corinthians 7:13.
2. especially, above others (A. V. more abundantly): 2 Corinthians 1:12; 2 Corinthians 2:4.