Real Dictionary

supra in American English
above (in the book, etc.)
adverb: above, esp. when used in referring to parts of a text

supra in British English
adverb: above, esp referring to earlier parts of a book etc

supra- in American English
above, over, beyond, or before
prefix: a prefix meaning “above, over” (supraorbital) or “beyond the limits of, outside of” (supramolecular; suprasegmental)

supra- in British English
prefix: over, above, beyond, or greater than