Etymology: ablative of duodecimus 'twelfth'
- A size of paper, so called because it is originally made by folding and cutting a single sheet from a printing press into 12 leaves; (5 by 7Â¾ inches): 6.5 to 7.5 inches high, approximately 4.5 inches wide.
- A page of that size; hence, a whole booklet having pages of this size
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