[{"Bold_text": "noun", "List Items": ["a person who is among those who first enter or settle a region, thus opening it for occupation and development by others.", "a person, group, or thing that is first or among the earliest in any field of inquiry, enterprise, or development:a woman who was a pioneer in cancer research;vehicles that were pioneers of automotive engineering.Synonyms: innovator , groundbreaker , trailblazer , leader", "one of a group of foot soldiers detailed to make roads, dig intrenchments, etc., in advance of the main body.", "Ecology.an organism that successfully establishes itself in a barren area, thus starting an ecological cycle of life.", "Pioneer,Aerospace.one of a series of U.S. space probes that explored the solar system and transmitted scientific information to earth.", "Pioneer,(formerly) a member of a Communist organization in the Soviet Union for children ranging in age from 10 to 16.Compare Komsomol(def2) Komsomol(def2), Octobrist(def) Octobrist(def)."]}, {"Bold_text": "verb (used without object)", "List Items": ["to act as a pioneer."]}, {"Bold_text": "verb (used with object)", "List Items": ["to be the first to open or prepare (a way, settlement, etc.).", "to take part in the beginnings of; initiate :to pioneer an aid program.", "to lead the way for (a group); trailblaze ."]}, {"Bold_text": "adjective", "List Items": ["being the earliest, original, first of a particular kind, etc.:a pioneer method of adult education.", "of, relating to, or characteristic of pioneers:pioneer justice.", "being a pioneer:a pioneer fur trader."]}]