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Latin word fidere comes from Proto-Indo-European *bʰeydʰ-, and later Proto-Indo-European *bʰéydʰeti (To trust.)
*bʰeydʰ- (Proto-Indo-European)
*bʰéydʰeti (Proto-Indo-European)
To trust.
*feiðō (Proto-Italic)
Trust.
fidere (Latin)