thereon

/ðɛrˈɑn/
adverb
  1. On or onto the thing that has just been mentioned.
    • She read the instructions and acted thereon without delay.
    • The table had a large vase, and a single rose rested thereon.
    • He signed the contract and placed his initials thereon.
  2. Immediately after that; then.
    • The judge announced the verdict, and thereon the courtroom fell silent.
    • The storm passed, and thereon the sun came out.
    • He finished his speech, and thereon the audience burst into applause.