1. of or relating to the number seven or forming a group of seven.
noun, plural septenaries.
3. a group or set of seven.
4. a period of seven years.
5. the number seven.
6. Prosody. a line of seven feet.
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Origin: 1570-80; < Latin septēnārius, equivalent to septēn(ī) seven each (sept(em) seven + -ēnī distributive suffix) + -ārius -ary
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