Plus is used to show that one number or amount is being added to another. Informally, it can also mean “and also” when listing extra things.
From Latin *plus* meaning “more,” used in mathematics in Europe from the late Middle Ages. It became a common spoken word in English, moving from math into everyday language.
In conversation, *plus* is a sneaky way to add arguments: “It’s cheaper, plus it’s faster.” You’re borrowing the authority of math—1 plus 1 equals 2—to make your reasons feel like they naturally add up.
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