Indicates that something is even more (to a greater degree) than another thing; used after a noun in constructions like “Xにも増してY.”
今年は例年にも増して暑い夏になりそうだ。
This year looks like it will be an even hotter summer than usual.
彼は仕事熱心なのはもちろん、家族思いにも増して地域活動に熱心だ。
He's diligent at work, and even more than being devoted to his family, he's active in community work.
母の病気を知って、兄は心配にも増して行動的になった。
When he learned of our mother's illness, my brother became more active rather than just worried.
彼女の日本語力は以前にも増して上達している。
Her Japanese ability has improved even more than before.