By The End Of The Year, Before The End Of This Year, Within The Year
noun
Inside the year means by the end of the year. In other words, before the end of this year, or within the year.
ねんない
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.
年内に牛の赤ちゃんが生まれます。
A calf will be born by the end of the year.
年内にアパートから出てって下さい。
Please leave the apartment by the end of the year.
年内にJLPT N4をとるのがゴールです。
The goal is to pass JLPT N4 by the end of this year.