事由 is read as じゆう (jiyuu) and means reason.
じゆう
jiyuu
いほうせいそきゃくじゆう
justifiable cause for noncompliance with the law
よしなしごと
trivial thing
じじつ
fact
じむ
office work
じけん
event
じむしょ
office
じじょう
circumstances
じむいん
clerk
じむしつ
office (room)
じじつじょう
as a matter of fact
じむきょく
secretariat
じむじかん
permanent vice-president