The meaning of VIRAL is of, relating to, or caused by a virus. How to use viral in a sentence. viral adjective (INTERNET) used to describe something that quickly becomes very popular or well known by being published on the internet or sent from person to person by email, phone, etc.: The word Viral means "relating to viruses " (small infectious agents). It may also refer to: Memetic behavior likened that of a virus, for example: 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. 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 rather than conventional mass media: viral marketing. Dec 23, 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. Viral definition: Of, relating to, or caused by a virus. In the context of social media, “viral” describes content such as videos, images, or posts that quickly achieve widespread popularity across the internet. This rapid dissemination primarily occurs through user shares on various platforms, catapulting the content into viral status. A viral film clip, story, or message is one that spreads quickly because people share it on social media and send it to each other. VIRAL definition: of, relating to, or caused by a virus. See examples of viral used in a sentence.