prolong

verb

pro·​long prə-ˈlȯŋ 

prolonged; prolonging; prolongs

transitive verb

1

: to lengthen in time : continue

2

: to lengthen in extent, scope, or range

prolongation

(ˌ)prō-ˌlȯŋ-ˈgā-shən  prə- 

noun

prolonger

prə-ˈlȯŋ-ər 

noun

Synonyms of prolong

• lengthen
• extend
• increase

Choose the Right Synonym for prolong

extend, lengthen, prolong, protract mean to draw out or add to so as to increase in length.

extend and lengthen imply a drawing out in space or time but extend may also imply increase in width, scope, area, or range.

extend a vacation

extend welfare services

lengthen a skirt

lengthen the workweek

prolong suggests chiefly increase in duration especially beyond usual limits.

prolonged illness

protract adds to prolong implications of needlessness, vexation, or indefiniteness.

protracted litigation

Examples of prolong in a Sentence

Additives are used to prolong the shelf life of packaged food.

High interest rates were prolonging the recession.

Recent Examples on the Web

Even Abigail Spanberger, the governor-elect in Virginia who swept to victory last week, said that her win shouldn't be viewed as an excuse to prolong the shutdown. —Zachary Schermele, USA Today, 10 Nov. 2025

The simplicity of the idea — that someone about to start immunotherapy could simply pop into their local pharmacy for an inexpensive shot that might prolong their life — should be enough to inspire everyone to put aside politics and invest in pursuing this promising finding. —Lisa Jarvis, Twin Cities, 8 Nov. 2025

Orbán has maintained enmity toward Ukrainian President Volodymyr Zelensky and blamed Europe’s support for Kyiv as prolonging the war. —Laura Kelly, The Hill, 7 Nov. 2025

Regular honey is processed by filtration and heating, which removes or inactivates many of the beneficial compounds in honey, but clarifies it and prolongs its shelf life. —Angela Ryan Lee, Verywell Health, 6 Nov. 2025

Word History

Etymology

Middle English, from Middle French prolonguer, from Late Latin prolongare, from Latin pro- forward + longus long

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for prolong

• agung
• along
• belong
• birdsong
• furlong
• headlong
• headstrong
• lifelong
• plainsong
• sarong
• tanjong
• weeklong

Kids Definition

prolong

verb

pro·​long prə-ˈlȯŋ 

: to make longer in time

prolonged the visit