English Reference
adjective · noun

viral

adj. · n.
US /ˈvaɪɹəɫ/ UK /vˈaɪəɹəl/ vi·ral

  1. 01 B2 Upper Intermediate Informal Computing

    adj.describes a video, photo, or story that spreads very quickly across the internet as people share it.

    adj.relating to or involving the rapid, exponential spread of information or content via social media and peer-to-peer sharing.

    Simple

    The video of the dancing cat went viral and got millions of views in just one day.

    In context

    The marketing team hoped the short documentary would go viral, generating organic brand awareness without the need for a traditional advertising budget.

  2. 02 B2 Upper Intermediate Technical Medicine

    adj.caused by or relating to a virus, which is a tiny living thing that can make you sick.

    adj.pertaining to, caused by, or of the nature of a biological virus.

    Simple

    The doctor said it was a viral infection, so antibiotics would not help.

    In context

    Researchers are investigating the long-term effects of various viral strains on the human immune system to better prepare for future outbreaks.

  3. 03 C1 Advanced Academic Computing

    adj.a way of selling things where customers tell their friends about a product.

    adj.relating to a marketing strategy that relies on individuals to pass on a marketing message to others.

    Simple

    The company used viral marketing to create a lot of excitement before the phone was even released.

    In context

    The success of the campaign was attributed to its clever use of viral loops, encouraging each new user to invite several others from their contact list.

  4. 04 C1 Advanced Informal Computing

    n.an image or video that has become very popular online.

    n.a piece of digital content that has been circulated rapidly and widely from one internet user to another.

    Simple

    She was surprised when her simple drawing became a viral overnight.

    In context

    The agency specialises in creating virals that look like amateur footage to increase their chances of being shared organically.

    memehit

Usage viral trends

The viral, no-frills meal prep trend of meat and rice is popular among gym bros.

NPR· 16 Aug 2026

Wells went missing on 4 July and a photo of the teen, who was Black, and his three friends on the trip, who were white, went viral.

The Guardian· 14 Aug 2026

From virus + -al.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Common
Updated