Passing along information or messages from one person or place to another; or laying something (like tiles or cables) again.
From 'relay' (from Old French 'relai', a fresh set of horses for a journey) + '-ing'. The meaning shifted from physical relay systems to communication relay.
The word 'relay' comes from a system of fresh horses stationed along routes—riders would change to fresh horses to maintain speed, an ingenious system that inspired modern relay races and information networks!
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