Lasting or intended to last the whole day.
Mid 19th century: from all + day.
- She had an all-day meeting with her boss.
- He went on an all-day hike in the mountains.
- The park was hosting an all-day music festival.
- She needed an all-day battery for her phone.
- The conference was an all-day event with speeches and workshops.
Some random words: superstructure, effervescent, whiplash