Entry 1 sense Webster, 1913 Professorial /prōfˌ-əs-ôr'-ē-əl/ · Pro·fes·so·ri·al · IPA /ˌprɒfəˈsɔːɹiəl/ 01 a. Of or pertaining to a professor; as, the professional chair; professional interest. 1. Of or pertaining to a professor; as, the professional chair; professional interest.