By A Definite Date(为期), 此释义来源于网络辞典。
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It means the host needs a definite head count for the planned event, and needs it by the date specified on the invitation.
FORBES: Importance of the RSVP
People might not feel so bad about waiting for treatment if they had a definite date for admission, and knew they were not being queue-jumped by less urgent cases.
ECONOMIST: Waiting for Dobbo
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