tester
1 Americannoun
noun
noun
noun
noun
noun
Etymology
Origin of tester1
First recorded in 1655–65; test 1 + -er 1
Origin of tester2
First recorded in 1350–1400; Middle English tester, testo(u)r, testir, teester “headpiece,” from Old French testiere “headpiece, head covering,” from Medieval Latin testerium, testrum, testura “canopy of a bed”; derivative of Vulgar Latin testa “head,” from Latin testa “earthenware jar; brick; tile”; see test 2
Origin of tester3
First recorded in 1560–70; earlier testorn, variant of teston, with -r- from Middle French testart “teston”
Explanation
When someone is a tester, they either administer tests or they assess the safety or function of a product. You might hope for an eventual career as a bubblegum tester. When you take a standardized exam, a tester will hand out papers and collect them when your time is up. And when you get a driver's license, a tester will ride along with you in the car during your road test. There's another type of tester that's a free sample, like a lipstick tester you can try on in a store. And an old-fashioned tester is the fabric canopy on the top of a four-poster bed.
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.
Bake: Pour into the pan and bake 50 to 60 minutes, until golden and a tester comes out clean or with a few moist crumbs.
From Salon ● Aug. 16, 2026
Improving third-party evaluations with initiatives such as a "trusted tester scheme" for the most risky types of challenges could also be used to limit adverse impacts, she said.
From BBC ● Aug. 6, 2026
Anthropic said that there are safeguards in place to prevent the AI system from being misused for cybersecurity tasks and that no tester has been able to broadly bypass these guardrails.
From Los Angeles Times ● Jun. 16, 2026
Morningstar raises its fair-value estimate for Advantest by 3% to 35,000 yen after lifting its system-on-chip tester revenue estimate by 3%.
From The Wall Street Journal ● Jun. 8, 2026
The Blue’s Clues tester played the part of Steve, and walked the kids through the script, making a careful note of all the questions they answered correctly and those that seemed to baffle them.
From "The Tipping Point" by Malcolm Gladwell
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.
