Entry 1 sense Webster, 1913 Voluntarily /välˌ-ən-tĕr'-əl-ē/ · Vol·un·ta·ri·ly · IPA /ˌvɑlənˈtɛɹɪli/ 01 adv. In a voluntary manner; of one's own will; spontaneously. 1. In a voluntary manner; of one's own will; spontaneously.