Definition of testing in English:

testing

Line breaks: test|ing
Pronunciation: /ˈtɛstɪŋ
 
/

adjective

Revealing a person’s capabilities by putting them under strain; challenging: it’s been quite a testing time for all of us

Definition of testing in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal