1. daypart - Noun
2. daypart - Verb
daypart (plural dayparts)
(television, radio) A part of the day in which a type of radio or television program apropos for that time period is aired.
Prime time is the daypart with the most viewers.
(television, radio, transitive) To divide the broadcasting day of (a station) into periods airing different types of material.
(television, radio, transitive) To assign (material) to such a period.
Source: en.wiktionary.org