conjunction
therefore; consequently; for that reason
Formal or literary conjunction used to state a logical conclusion based on the preceding statement. Similar to だから but more written and reasoned.
彼は証拠をすべて隠滅した。故に、有罪は免れない。
He destroyed all the evidence. Therefore, he cannot escape conviction.
我思う、故に我在り。
I think, therefore I am.