in this

1. 1.

   (formal) in or into that thing or place

   “they can read therein what our plans are”

   Synonymsthereinin that

   formality

Questions about in this

What does in this mean?

in this means "(formal) in or into that thing or place".

What is another word for in this?

Close synonyms include therein, in that. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is in this a common word?

in this is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.