1. a person who is among those who first enter or settle a region, thus opening it for occupation and development by others.
2. one who is first or among the earliest in any field of inquiry, enterprise, or progress: pioneers in cancer research.
3. one of a group of foot soldiers detailed to make roads, dig intrenchments, etc., in advance of the main body.
4. Ecology. an organism that successfully establishes itself in a barren area, thus starting an ecological cycle of life.
"people can be pioneering in places."
"people can be pioneering in/at/on autumns."
"places can be pioneering in places."
"places can be pioneering in mentalities."
"works can be pioneering."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.