Latest, End, Conclusion, Final
Noun and の adjective
さいご
お前に金をやるのは、これが最後だ。
This is the last time I give you money.
うちのつま、いつも最後に一言多いんですよね。
My wife always ends up with one word too many.
とにかく、最後まで聞いてよ。そうすれば分かるから。
At any rate, just listen until the end. Then you’ll understand.
The thing that is the most after everything else is at the very end. It is the last.
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.