I. noun
( -s )
Etymology: from gerund of test (II)
: an act or process of subjecting to test : examination , trial
the testing of 50 million children … for tuberculosis — Paul Harris
laboratories concerned … with commercial testing — Science
II. adjective
Etymology: from present past. of test (II)
1. : of, relating to, or used for demonstration or experiment
testing procedure
testing ground
2. : requiring maximum effort or ability
confronted with a most difficult and testing problem — Ernest Bevin
felt out of practice for severe rock climbing and wanted something less testing — Tom Weir
• test·ing·ly adverb