trialling

verb

1. (UK)(Canadian spelling, common) present participle and gerund of trial

noun

1. (uncountable, usually)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. (uncountable, usually)The running of trial races, especially for horses or greyhounds.