A message, errand, or mission, especially one carried by an ambassador or envoy.
From Old French 'ambassade,' derived from 'ambaceia' (task, service) which likely comes from Celtic roots. The word was heavily influenced by 'ambus' (servant) and eventually became connected to diplomatic missions and official messages.
In medieval times, 'ambassage' referred to any important message or mission, not just diplomatic ones—it's related to 'ambassador,' and interestingly, the whole word family might trace back to Celtic languages, showing how thoroughly different languages mixed in medieval Europe.
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