The quality or state of being fashionable; the degree to which something or someone follows or conforms to current fashion trends.
From 'fashionable' plus the abstract noun suffix '-ity,' creating a noun for the measurable quality of being in fashion. Emerged in modern English as consumer culture expanded.
The fashionability of colors, fabrics, and styles changes so fast that marketing companies track it scientifically—trend forecasters use data to predict what will suddenly seem essential versus dated, turning taste into measurable information.
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