以内
Kana: いない
within
Example sentence
三日以内にお返事します。
みっかいないにおへんじします。
I will reply within three days.
What 以内 means
以内 (いない) is a Japanese word meaning “within”. It belongs to the Grammar & Phrases topic and appears at Level 2, so it is one of the words worth learning early when you study Japanese.