In the main

prep_phrase

Definitions

Adverb
  1. 1
    without distinction of one from others wordnet
  2. 2
    for the most part wordnet
Prep_phrase
  1. 1
    Principally; on the whole; for the most part.

    "[…] I entirely agree with you in the main as to the propriety of doing everything one could by way of providing for a child one had in a manner taken into one's own hands; […]"

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