Entry 2 senses Webster, 1913 Nonprofessional /nänˌ-prəf-ĕsh'-ən-əl/ · Non·pro·fes·sion·al · IPA /nˌɑnprəfˈɛʃənəl/ 01 a. Not belonging to a profession. 1. Not belonging to a profession. 2. Not done by, or proceeding from, professional men; contrary to professional usage; unprofessional.