The term 'liminality' was coined by Victor Turner and based on the work of Arnold van Gennep. Many Pagans use it to mean the edginess of marginal spaces, times and practices. Examples of liminal spaces are a sacred space, which is often viewed as being between the worlds (especially in Wicca); a stone circle; the edge of a parish; or the sea-shore, especially the part between the high- and low-tidelines. Examples of liminal times are dawn and dusk, the new year, midnight, moon phases and seasonal festivals, as these are turning points between the old and the new, neither one thing nor the other, and these moments are deemed to be particularly good for contacting the numinous. Examples of liminal practices are Seiðr, witchcraft, shamanism, and queer sexuality.

• Wikipedia article on liminality