To Judge
To Conclude
する verb
判断 is judgement. Make that into a verb and you have to judge, or to conclude.
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. It will help to know 判断 before learning this, but if you don't I won't judge you (the Crabigator will).
食用キノコか毒キノコかを判断するのは難しい。
It's difficult to judge whether it's an edible or poisonous mushroom.
よく人を見た目で判断してはいけないと言いますが、それは本当に正しいことだと思いますか？
It's often said you shouldn't judge people by their appearance, but do you think that's really true?
これまでに聞いたことから判断すると、どうやら真打ちは最後にあるようだね。
Judging from what I've heard, the best seems to have been saved for last.