As an adjective, it means of the best quality or at the best stage, or relating to prime numbers in math. As a noun, it is the time in life when someone is strongest or most active. As a verb, it means to prepare someone or something for use or action.
From Latin *primus* meaning 'first', through Old French *prime*. It has kept the idea of being first in rank, time, or quality.
Prime numbers are called 'prime' because they’re like building blocks—other numbers are made by multiplying them. When you’re 'in your prime', the word suggests you’re at your best building stage too. Even 'Prime time' TV uses the same idea: the first and best slot.
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