First numbers we used at first grade at peimary school were the natural numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10... Next we learnt all have successors, and all but 1 have predecessors. Then we learned the first decade is 1-10, second is 11-20 and so on.
Many people misinterpret these as the decade... When some one mentiones decade, without qualifying it, it signifies a calendar decade, from a calendar that uses natural numbers, thus: 1-10, 21-30, 1991-2000, 2001-2010, 2011-2020... And, there are people, who mix them up...
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Even worse, people who know this dinstinction, but still chose to propagate the lexical (have same part of the name) over the semantical (natural numbers mathematics) meaning of the word “decade” out of spite because they didn’t like being corrected when they propagated confusion
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