From Middle English in as muche as, in as muchel as.

1. Because of the fact that; since.

   Synonyms: as, for, given that, Thesaurus:because

   • 1843 December 18, Charles Dickens, “(please specify the page number)”, in A Christmas Carol. In Prose. Being a Ghost Story of Christmas, London: Chapman & Hall, […], →OCLC ↗:

     Which it certainly was. Admiration was the universal sentiment, though some objected that the reply to "Is it a bear?" ought to have been "Yes;" inasmuch as an answer in the negative was sufficient to have diverted their thoughts from Mr. Scrooge, supposing they had ever had any tendency that way.

   • 1952, United States. Congress. House. Committee on Appropriations, Moroccan air base construction. 2 v, page 618:

     This employee was engaged to direct asphalt plants and inasmuch as the work for which he had been employed was completed, he was surplused and his return travel was approved […]

2. To the extent that; insofar as.

   Synonyms: inasfar as, insofar as

   You will improve, but only inasmuch as you practise.

• French: dans la mesure où
• German: alldieweil (dated), da
• Portuguese: já que
• Spanish: supuesto que, ya que, en tanto

• French: à la condition que
• German: insoweit
• Portuguese: no que, quando
• Russian: поско́льку
• Spanish: en tanto y en cuanto