Meaning & usage
由, read よし, reports information learned through a letter or other written correspondence, meaning that a contact has stated that something is the case. It follows a noun phrase with との, as in 中止との由である, or a plain-form verb, adjective, or noun predicate with という, as in 退任するという由である and 入院中という由である. As formal epistolary language, it closes with である or です rather than casual だ, and it carries no sense of doubt.
Example sentences 3
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展示会は中止との由である。
It is reported that the exhibition has been cancelled.
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社長は来月退任するという由である。
It is reported that the president will step down next month.
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支店は統合されるという由である。
It is reported that the branch office will be merged.