Japanese edit

For pronunciation and definitions of かいさい – see the following entries.
快哉
[noun] delight, great joy
改歳
[noun] (literary) new year, change of year
皆済
[noun] payment in full
[verb] pay off one's debts
開催
[noun] holding a conference or event
[verb] hold an event
(This term, かいさい, is the hiragana spelling of the above terms.)