1. immediately after this; as a result of this
Usage: formal; literary

Examples

• The contract was signed, and hereupon the work began immediately.
• She received the news of her promotion, hereupon calling her family to share the good news.
• The judge announced the verdict, hereupon the courtroom erupted in cheers.
• The storm clouds gathered, and hereupon the sailors prepared for rough weather.
• He finished his speech, hereupon the audience gave him a standing ovation.
• The treaty was ratified, hereupon diplomatic relations were restored.