Cave/keɪv/ Definition 1 of 4Pro Tip 1/3Natural Setting Use 'cave' when referring to natural underground spaces, not man-made ones. The tour includes a visit to a natural cave with stunning stalactites. Pro Tip 2/3Adventure Context 'Cave' can imply mystery and adventure, often used in stories about exploration. The treasure map led us straight to a hidden cave. Pro Tip 3/3Habitat or Shelter 'Cave' can refer to a shelter for animals or primitive humans. Bears often use caves as shelters during the winter.