- a cover, usually an envelope, postmarked on the first day of the issue of its stamps
| 单词 | first-day cover |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 first′-day cov′er (fûrst′dā′, -dā′),USA pronunciation [Philately.]
Collins Concise English Dictionary © HarperCollins Publishers:: first-day cover n
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