not understandable by reason alone; beyond rational comprehension
Word origin
[1815–25; supra- + rational]This word is first recorded in the period 1815–25. Other words that entered Englishat around the same time include: aesthetic, aggressive, norm, treadmill, trolleysupra- is a prefix meaning “above, over” (supraorbital) or “beyond the limits of, outside of” (supramolecular; suprasegmental)