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Definition of SMS
: a technology for sending short text messages between mobile phones
Although driven by teens and young adults who seemingly aren't satisfied with online instant messaging, SMS can be very useful for sending urgent messages to family members or co-workers. — Consumer Reports
—often used before another noun Creative, colorful, and sometimes perplexing, emoji add energy to SMS messages.— Christina Bonnington
also
: a message sent using this technology : text message
… is helping to test a device that implants sensors in cows to let farmers know when they are in heat. When that is the case, the device sends an SMS to the farmer's phone. — John Tagliabue
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