An alternative spelling of centiar; a metric unit of area equal to one square meter.
From French 'centiare,' combining 'centi-' (one hundredth) and 'are' (a unit of land area from Latin 'area'). The variant spelling exists because of differences in how French and English adopted the metric term.
Even though centiar and centiare are the same measurement, the spelling difference shows how the metric system was adopted differently across countries—French scientists preferred the '-are' ending while English speakers sometimes simplified it!
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