English Reference
noun · adjective

testing

n. · adj.
US /ˈtɛstɪŋ/ UK /tˈɛstɪŋ/ test·ing UK spelling testings

  1. 01 B1 Intermediate

    n.the process of checking a person, machine, or system to see if it works well.

    n.the systematic process of evaluating the quality, performance, or reliability of something before it is put into widespread use.

    Simple

    The new software is currently undergoing testing to find any bugs.

    In context

    Rigorous safety testing is mandatory for all new medical devices before they can be approved for clinical trials by the regulatory board.

    Usage

    Often used as an uncountable noun when referring to a general process.

  2. 02 B2 Upper Intermediate

    adj.difficult to deal with because it requires a lot of effort or patience.

    adj.challenging or demanding; specifically used for situations that strain one's endurance or abilities.

    Simple

    It has been a testing time for the family since they lost their home.

    In context

    The marathon proved to be a testing experience for even the most seasoned athletes due to the unexpected heat and humidity.

    Usage

    Usually placed before the noun it describes.

Usage require testing

He then sought to persuade the parents to give them to him in turn by offering to arrange for cutting-edge DNA testing.

The Guardian· 15 Aug 2026

An ‘extraordinary’ fire season is testing those who are left.

The New York Times· 14 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Common
Updated