Definition of instant messaging in US English:

instant messaging

noun

  • See instant message

    • ‘She sat there for a minute thinking of what to do, and then she got another instant message, this one was from Sarah.’
    • ‘That instant message you send from work could put your company's computer network at risk…’
    • ‘Just before she began to read, an AOL instant message popped up at her, surprising her a little; she'd forgotten she'd signed on.’
    • ‘Even if you don't look at each and every email or instant message they send, you'll have a good idea if they are making smart choices online.’
    • ‘A day's weather forecast, the arrival and departure times for an airplane flight, an abstract from a long publication, or a single instant message can all be examples of microcontent.’