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Synonyms

yearlong

American  
[yeer-lawng, -long] / ˈyɪərˈlɔŋ, -ˈlɒŋ /
Or year-long

adjective

  1. lasting for a year.

yearlong British  
/ ˈjɪəˈlɒŋ /

adjective

  1. throughout a whole year

"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 yearlong

First recorded in 1805–15; year + 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.

In the yearlong Phase 2b study, nearly 40% of patients who received Nektar’s treatment, rezpegaldesleukin, showed a 50% or better improvement in their severity of alopecia score, compared to 13.6% of placebo patients.

From Barron's • Apr. 20, 2026

Then, after a yearlong drought, he finally notched his sixth victory for 23XI at Daytona Motor Speedway, by putting his improvisational skills on full display.

From The Wall Street Journal • Mar. 3, 2026

If confirmed, this world could become the first Earth-size exoplanet in a yearlong orbit that passes in front of a nearby, bright Sun-like star, making it an especially valuable target for follow-up research.

From Science Daily • Feb. 12, 2026

Gaga’s Grammy performance comes in the middle of her nearly yearlong Mayhem Ball tour, which will end in April.

From Los Angeles Times • Feb. 1, 2026

As far as he was concerned, it had been a yearlong nightmare.

From "Boots on the Ground: America's War in Vietnam" by Elizabeth Partridge

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.