In or according to the current fashion or style; fashionable, stylish, and in keeping with what is popular at the moment.
From French 'à la mode' meaning 'in the fashion,' which entered English in the 17th century. The phrase became so common it was eventually written as one anglicized word in English.
À la mode started as fancy French phrase and became so common in English that we now write it as one word! It appears in recipes (pie à la mode with ice cream) and fashion, showing how cuisine and clothing both follow trends.
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