IPA: /ˌriːˈvæk.sɪ.neɪt/
KK: /rɪˈvæk.sɪ.neɪt/
To give someone a vaccine again after they have already been vaccinated.
The health department decided to revaccinate all children to ensure they were protected against the disease.
Past: revaccinated
Past Participle: revaccinated
Revaccinate → It is formed from "re-" (meaning again) and "vaccinare" (meaning to make a cow, from Latin *vaccinus*, meaning of a cow, related to vaccination). The word means to vaccinate again or to administer a vaccine a second time.
Think of 're-' meaning again, and 'vaccinare' relating to vaccination — so revaccinate means to vaccinate again.