What does ichibon mean in japan?

Answer 1

Perhaps you mean 'ichiban' (一番) which is japanese for 'best', 'number one', 'most' or 'favorite'. It can be used in the following sentences:

一番好きな食べ物はすしです

Ichiban sukina tabemono wa sushi desu

My favorite food is sushi

日本で一番有名な市は東京です

Nihon de ichiban yuumeina ichi wa toukyou desu

Tokyo is the most famous city in Japan

I hope this helps.