Revision
Amendment, Alteration
noun, する verb, の adjective
Renew and make something correct. When you do this, you are doing a revision, amendment or alteration. Ah, much better now.
かいせい
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
四月から、JR山手線のダイヤが改正されます。
The schedule for the JR Yamanote Line will be revised in April.
インターネットの改正料金、もうチェックしましたか？
Have you checked the revised Internet rates?
市民団体は、公共の場でおならを禁止する法律の改正を求めた。
Citizen groups demanded a revision of the law banning farting in public.