What's the difference between duodenary and septenary?

Duodenary

Definition:

• (a.) Containing twelve; twelvefold; increasing by twelves; duodecimal.

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Septenary

Definition:

• (a.) Consisting of, or relating to, seven; as, a septenary number.
• (a.) Lasting seven years; continuing seven years.
• (n.) The number seven.

Example Sentences: