资料来源 : Webster's Revised Unabridged Dictionary (1913)

Praecognita \Pr[ae]*cog"ni*ta\, n. pl. [L. praecognitus, p. p.
   of praecognoscere to foreknow. See {Pre-}, and {Cognition}.]
   This previously known, or which should be known in order to
   understand something else.