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1. [of someone] in a legal case before a judge. The criminal was on trial for over three months. lam not on trial. Don't treat me like that!
2. being tested; being examined or experimented with. The new strain of wheat is on trial in Kansas at the present time. The teaching method is on trial in the school system.
1. In the process of being tried, especially in a court of law. For example, He would be put on trial for the murder of his wife. [Early 1700s]
2. As a test of something, on probation, as in They said we could take the vacuum cleaner on trial and return it if it was too noisy. [Early 1700s]
In the process of being tried, as in a court of law.