The Collaborative International Dictionary
liminality \liminality\ n. (Anthropology)
that temporary state during a rite of passage when the
participant lacks social status or rank, is required to
follow specified forms of conduct, and is expected to show
obedience and humility.
--RHU
Wiktionary
n. (context anthropology philosophy sociology psychology English) The state or quality of ambiguity which exists in the middle stage of certain events or rituals (such as a rite of passage or a society-wide revolution), during which the participating individual or group no longer holds its pre-ritual status but has not yet attained the status it will hold when the ritual has been completed.
Wikipedia
In anthropology, liminality (from the Latin word līmen, meaning "a threshold") is the quality of ambiguity or disorientation that occurs in the middle stage of rituals, when participants no longer hold their pre-ritual status but have not yet begun the transition to the status they will hold when the ritual is complete. During a ritual's liminal stage, participants "stand at the threshold" between their previous way of structuring their identity, time, or community, and a new way, which the ritual establishes.
The concept of liminality was first developed in the early 20th century by folklorist Arnold van Gennep and later taken up by Victor Turner. More recently, usage of the term has broadened to describe political and cultural change as well as rituals. During liminal periods of all kinds, social hierarchies may be reversed or temporarily dissolved, continuity of tradition may become uncertain, and future outcomes once taken for granted may be thrown into doubt. The dissolution of order during liminality creates a fluid, malleable situation that enables new institutions and customs to become established. The term has also passed into popular usage, where it is applied much more broadly, undermining its significance to some extent.