Number One
The First, First, The Best, Best, The Most, Most
When you're the number one in a number in a series, you're number one ba-bay!
いちばん
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.
イチゴあじのあめが、この中で一番すきです。
I like the strawberry flavored candy best out of all of these.
わたしが人生で一番さいしょによんだ教かしょは、テキストフグです。
The first textbook I read in my life was TextFugu.
シドニー・クロスビーは、世界で一番うまいホッケー選手だ。
Sydney Crosby is the number one hockey player in the world.