refresher

noun4

1. •
   Something that refreshes.

   • The nap was a welcome refresher.
2. •
   A review to refresh or renew knowledge.

   • They recommend a refresher class every few years.
3. •
   An equity grant given by a company to an existing employee, as opposed to an initial grant given to new employees.
4. •
   A fee paid to counsel to continue with a case, especially one that was adjourned.