daylong

American

[dey-lawng, -long] / ˈdeɪˌlɔŋ, -ˌlɒŋ /

adjective

during the entire day; lasting all day.

a daylong trip.

daylong British

/ ˈdeɪˌlɒŋ /

adjective

lasting the entire day; all day

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of daylong

First recorded in 1850–55; day + long ¹

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It also came after sunrise, just as practicing Muslims began the daylong fast during the Islamic holy month of Ramadan.

From The Wall Street Journal • Feb. 28, 2026

The 2026 Roundtable met on Jan. 5 in New York for a daylong discussion of the investment backdrop and the 11 panelists’ latest picks.

From Barron's • Jan. 16, 2026

One of them, on July 12, is a daylong retreat in the forest in Topanga.

From Los Angeles Times • Jan. 1, 2025

Researchers analyzed a dataset of daylong audio recordings collected in English-learning infants' home environments at ages 6, 10, 14, 18 and 24 months.

From Science Daily • May 30, 2024

Ernest’s response contrasted sharply with that of Compton, who sat for a blistering daylong deposition by the Tribune’s lawyers without wavering for a moment in his defense of Kamen.

From "Big Science" by Michael Hiltzik

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023