Definition of "birthnight" []

• The night of someone's birth. (noun)
• The anniversary of that night in subsequent years. (noun)

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• "One night in May — it was her birthnight, and twenty years since she had left her home — Hugh Graham sat in the room she had hallowed in his boyish days."
• "It is probable the star had shone in the very birthnight: and thence-forward to this very time it had disappeared."
• "London is thin, & the only party I have heard of is one at Mrs Knox's on the birthnight."