adverb
especially; particularly; above all
Emphatic adverb meaning 'especially' or 'more than anything else'; stronger than わけて. Used to single out the most important thing among several.
See also: わけて
わけても彼の優しさが心に残っている。
Above all, his kindness remains in my heart.
この地域では、わけても夏の暑さが厳しい
In this region, the summer heat is especially severe.
Derived from the verb 分ける (to divide) in its te-form 分けて, with the emphatic particle も attached. The exact historical development is uncertain, but it likely arose from the idea of 'dividing things and singling one out'.