Degree
Extent, Level
noun, suffix
The extent degrees show to what degree or extent you're willing to take something.
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.
この程度の金額でビビってたらなんにもできないよ。
If you get scared by just this amount of money, you wouldn't be able to do anything.
そのウワサについて、どの程度ご存知ですか？
To what extent do you know about the rumors?
本気で怒らせない程度に、ほどほどにね！
Just not to the point of seriously offending him, but in moderation!
彼は実際は35歳だが、3歳児と同程度の知能水準しかない。
He is actually 35 years old, but has no more intelligence than a three year old kid.