Everyday describes things that are normal, usual, or used regularly, like everyday clothes or everyday language. It is different from 'every day', which means 'each day'.
It comes from the phrase 'every day', which over time became a single word when used before nouns. The joined form took on the meaning of 'ordinary' or 'common'.
The space in 'every day' actually changes the meaning: 'everyday shoes' are ordinary, but 'every day shoes' are worn daily. A tiny space on the page secretly controls the time and style in your sentence.
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