Final answer:
The word 'vaccine' has gained popularity and new meaning due to the COVID-19 pandemic. It now specifically refers to the COVID-19 vaccine and is used in discussions about public health and controlling the spread of the virus.
Step-by-step explanation:
One word that has gained popularity in the last year or so is 'vaccine.' The word itself is not new, but its meaning and use have evolved due to the COVID-19 pandemic. In the past, 'vaccine' referred to a preventive treatment for diseases, but now it specifically refers to the COVID-19 vaccine that helps protect against the virus.
The word 'vaccine' has become highly relevant in discussions surrounding public health and the global response to the pandemic. It is used to describe the development, distribution, and administration of COVID-19 vaccines, as well as the impact they have on controlling the spread of the virus.
Overall, the word 'vaccine' represents a significant advancement in medical science and public health, making it a word of great importance and relevance in today's world.