Complete, Finish, Conclusion
noun, する verb, の adjective
A perfect finish is when everything is at total completion. Nothing is left over and all is done.
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.
The redevelopment that's been ongoing for a while in this town has finally been completed.
I’ll call you back when my cellphone battery has finished charging, okay?