Permanent, Perpetual
noun, の adjective
A thing that's constant for a long time becomes permanent. Leave a shoe on the sidewalk for a long time? Permanently stuck there. Constantly making dumb faces? Permanently stuck like that.
こうきゅう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
恒久の平和を祈っています。
I pray for perpetual peace.