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Wiktionary
pronominal adverb

n. A type of adverb occurring in a number of Germanic languages, formed in replacement of a preposition and a pronoun by turning the latter into a locative adverb and the former into a prepositional adverb and joining them in reverse order.

Wikipedia
Pronominal adverb

A pronominal adverb is a type of adverb occurring in a number of Germanic languages, formed in replacement of a preposition and a pronoun by turning the latter into a locative adverb and the former into a prepositional adverb and joining them in reverse order.

For example:

  • For that → therefor
  • In that → therein
  • By this → hereby
  • To this → hereto
  • In which → wherein