Dictionary.com
Thesaurus.com
Synonyms

tester

1 American  
[tes-ter] / ˈtɛs tər /

noun

  1. a person or thing that tests.


tester 2 American  
[tes-ter, tees-] / ˈtɛs tər, ˈtis- /

noun

  1. a canopy, as over a bed or altar.


tester 3 American  
[tes-ter] / ˈtɛs tər /

noun

  1. the teston of Henry VIII.


tester 1 British  
/ ˈtɛstə /

noun

  1. a person or thing that tests or is used for testing

"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

tester 2 British  
/ ˈtɛstə /

noun

  1. (in furniture) a canopy, esp the canopy over a four-poster bed

"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

tester 3 British  
/ ˈtɛstə /

noun

  1. another name for teston

"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 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”; test 2

Origin of tester3

First recorded in 1560–70; earlier testorn, variant of teston, with -r- from Middle French testart “teston”

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.

Recently an AI bot created by Stanford researchers outperformed some human testers in looking for security flaws in a network.

From The Wall Street Journal

The document says human testers from AI companies should randomly evaluate 4,000 pieces of training data for each format of content their AI can handle, such as text, video and images.

From The Wall Street Journal

Institute experts also looked at the possibility of models "sandbagging" - or strategically hiding their true capabilities from testers.

From BBC

And to make things interesting, they pitted Artemis against real-world professional hackers, known as penetration testers.

From The Wall Street Journal

Why Williams would ask for her name to be added, without any intention of playing again, remains a mystery - as joining the list invites a visit from out-of-competition testers.

From BBC