lim·i·nal 
(lĭmə-nəl)
(lĭmə-nəl)adj.
1. Intermediate between two states, conditions, or regions; transitional or indeterminate: "While doctors operate, she hangs suspended in the liminal space between life and death" (Jeremy Eichler).
2. Existing at the limen. Used of stimuli.
[Latin līmen, līmin-, threshold + -AL1.]
lim′i·nali·ty (-nălĭ-tē) n.
limi·nal·ly adv.