Relating to or based on the number ten or a group of ten.
From Latin 'decadarius' derived from 'decada' (group of ten) + '-ary' (suffix meaning 'relating to'). This adjective describes anything associated with groupings or systems based on the number ten, with roots in Latin administrative terminology.
Our decimal number system is inherently decadary—we count in tens because humans have ten fingers, and different cultures actually did invent systems based on other numbers, like the Mayans who used a vigesimal (base-20) system.
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