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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

A month after the fire, Bass selected Illinois-based Hagerty Consulting to work on fire recovery under a yearlong contract for up to $10 million.

From Los Angeles Times • Feb. 19, 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

It means empowering primary-care doctors—the clinicians most people see—to detect Alzheimer’s early and guide families through treatment and lifestyle options rather than referring them to specialists with yearlong wait times.

From The Wall Street Journal • Feb. 3, 2026

Nobody ever would have guessed that this morning marked the beginning of Cole’s yearlong banishment.

From "Touching Spirit Bear" by Ben Mikaelsen

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.