A message or telegram sent through an undersea cable, especially between continents.
From cable combined with -gram (from Greek gramma, meaning something written). The term was used from the late 1800s to mid-1900s for telegraph messages sent via submarine cables.
Before the internet, cablegrams were the ultimate in long-distance speed—a message could cross the Atlantic in hours instead of weeks, making them crucial for business and diplomacy during two world wars.
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