prime time

Short definition from Wiktionary

Noun

1. 1
   The block of programming on television during the middle of the evening, usually between 7:00 pm and 11:00 pm.
2. 2
   The busiest or most important period.
3. 3
   Maturity; the state at which a person or product will be accepted by the mainstream.
4. 4
   Spring.
5. 5
   A new period or time of youthfulness; the beginning of something.

Adjective

1. 1
   Showing or broadcasting during prime time.
2. 2
   Alternative spelling of prime time.