- expert [eks′pərt; ] for adj., also [ eks pʉrt′, ik spʉrt′]adj.[ME < OFr < L expertus, pp. of experiri: see PERIL]1. very skillful; having much training and knowledge in some special field2. of or from an expert [an expert opinion]n.[Fr]a person who is very skillful or highly trained and informed in some special fieldexpertlyadv.expertnessn.
English World dictionary. V. Neufeldt. 2014.