whereof

Meanings

1. 1
   conj

   of which or of whom; now chiefly formal or archaic

   The archive contains five ledgers, whereof two are badly damaged.

2. 2
   adv

   of what; now chiefly in the expression know whereof one speaks

   Having survived the expedition, she knew whereof she spoke.

From Middle English wherof, a compound of where + of. It belongs to an older family of compound relatives and adverbs such as thereof, wherein, and whereupon.

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