prime1
• adjective 1 of first importance; main. 2 of the best possible quality; excellent. 3 (of a number) divisible only by itself and one (e.g. 2, 3, 5, 7). • noun 1 a time of greatest vigour or success in a person’s life. 2 a prime number. 3 Printing a symbol (&p;) written as a distinguishing mark or to denote minutes or feet. 4 Christian Church a service traditionally said at the first hour of the day (i.e. 6 a.m.), but now little used. — ORIGIN from Latin prima hora ‘first hour’ from primus ‘first’.
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