One of the mysteries of the English language finally explained.
Relating to or based on the number six.
- ‘Because six is the product of the first two prime numbers and is adjacent to the next two prime numbers, many senary fractions have simple representations.’
- ‘Base 2 is called binary, Base 3 is called ternary, Base 4 is called quaternary, Base 5 is called quinary, Base 6 is called senary, Base 7 is called septenary, Base 8 is called octonary or octal.’
Late 16th century: from Latin senarius ‘containing six’, based on sex ‘six’.
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