conjunction
therefore; for that reason; so
A formal or written conjunction that states a logical consequence. In casual speech, だから is more common.
彼は証拠を隠した。それゆえ、有罪と判断された。
He hid the evidence. Therefore, he was found guilty.
This problem is complex. For that reason, a careful response is needed.
だから is the casual, everyday equivalent of それゆえ. それゆえ is more formal and often used in writing or speeches.
したがって is also a formal conjunction meaning 'therefore', but it is slightly more common in academic or logical contexts than それゆえ.
Compound of それ (that) and 故 (reason/cause). The kanji 故 carries the meaning of 'reason' or 'cause', giving the literal sense 'for that reason'.