The meaning of VIRAL is of, relating to, or caused by a virus. How to use viral in a sentence. VIRAL definition: 1. caused by a virus: 2. used to describe something that quickly becomes very popular or well…. Learn more. Define viral. viral synonyms, viral pronunciation, viral translation, English dictionary definition of viral. adj. 1. Of, relating to, or caused by a virus. 2. Of or relating to the rapid propagation of information, ideas, or trends by means of social networks 4 meanings: 1. of, relating to, or caused by a virus 2. (of a video, image, story, etc) spread quickly and widely among . Click for more definitions. used to describe a piece of information, a video, an image, etc. that is sent rapidly over the internet and seen by large numbers of people within a short time. Within 24 hours, the video went viral on YouTube and Facebook. Definition of viral adjective in Oxford Advanced Learner's Dictionary. Aug 17, 2025 · Yet again, something dreadful and new which he doesn't understand is going viral. Today's fad is, you paint a black vertical rectangle on the wall, or on a mirror, or over the top of a picture. pertaining to or involving the spreading of information and opinions about a product or service from person to person, especially on the internet or in emails. a clever viral ad. becoming very popular by circulating quickly from person to person, especially through the internet. Viral refers to anything that rapidly spreads or gains popularity, particularly through sharing and circulation on digital platforms such as social media. The word Viral means "relating to viruses " (small infectious agents). It may also refer to: Memetic behavior likened that of a virus, for example: VIRAL meaning: 1 : caused by a virus; 2 : spreading very quickly to many people especially through the Internet