Relating to or characteristic of friends; friendly or amicable (archaic/technical usage).
From Latin 'amicus' (friend). This direct Latin adjective was occasionally used in English technical writing but was largely superseded by the more common forms 'amical' and 'amicable.'
This is a ghost word in English—it appears in old texts and dictionaries but almost never in modern usage because 'amical' and 'amicable' took over its job, showing how even technical Latin-derived terms compete for survival in the language.
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