Of the best possible quality; excellent. The prime location of the hotel made it a popular choice for tourists.
The prime objective of the meeting was to discuss the budget.
Having the highest rank or authority. The prime minister attended the international summit.
Mathematics: (of an integer) having exactly two positive divisors, 1 and itself; not composite. Since 13 is a prime number, it cannot be divided evenly by any number other than 1 and 13.
Occurring first in order or time; earliest, original. The prime cause of the accident was a faulty brake line.