1. from that time forward; from then on
Usage: formal; literary

Examples

• The treaty was signed in 1945, and thenceforth the two nations remained allies.
• She graduated from college and thenceforth devoted herself to medical research.
• The company changed its policy in January and thenceforth required all employees to work remotely.
• He inherited the estate at age 21 and thenceforth lived as a wealthy landowner.
• The law took effect immediately and thenceforth smoking was banned in all public buildings.
• After the accident, she walked with a cane and thenceforth avoided driving at night.