OFFLE
The Open Full-Form Lexicon of English
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Word:

trial - verb

intransitive; transitive

Infinitivetrial
3rd person singulartrials
Pasttrialed (only inAmerican) / trialled (only inBritish)
Past Participletrialed (only inAmerican) / trialled (only inBritish)
Present Participletrialing (only inAmerican) / trialling (only inBritish)