Number One
The First, First, The Best, Best, The Most, Most
noun
When you're the number one in a number in a series, you're number one ba-bay!
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.
一番高い
most high, most expensive
一番いい
best
一番多い
most numerous
一番大切な人は、自分の子です。
The most important person is my own child.
今週のテストで一番高い点数をとりたいです。
I want to get the highest score on this week's test.
これが、今全米で一番人気の曲ですよ。
This is the most popular song in all of America right now.