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trial and error
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Quick answer
As a noun, trial and error means experimenting until a solution is found. As an adjective, it means trying out various means or theories until error is satisfactorily reduced or eliminated.
Meanings of trial and error
3 meaningsnoun
Experimenting until a solution is found
adjective
Trying out various means or theories until error is satisfactorily reduced or eliminated
“he argued that all learning is a trial-and-error process that resembles biological evolution”
Relating to solving problems by experience rather than theory
“they adopted a trial-and-error procedure”
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).