Literary adverb used in formal or written contexts to refer to a point in the past from which something has continued or changed. In modern Japanese, それ以来 or その後 are more common.
He left his hometown ten years ago and has not returned since.
After that incident, her attitude changed from then on.
Literary kanji form; rarely used in modern writing.
Kana spelling is practical for modern use, as the kanji forms are literary and rare.
Variant kanji form; even less common than 爾来.
A Sino-Japanese reading of Classical Chinese 爾来, literally “from that time onward” and hence “since then.”