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In some senses, trialling is marked as UK. Watch for register when choosing this word.
trialling
noun 2verb 1
Definitions
verb
1
(Canadian spelling, common) present participle and gerund of trial
noun
1
The process of running a trial; an experiment or pilot.
Barker's proposal to try out new equipment before mass introduction should also have been heeded, because traction components bought without trialling for the Glasgow and Great Eastern schemes gave trouble.
2
The running of trial races, especially for horses or greyhounds.
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