Hereinafter vs. Herein

Hereinafteradverb

In the parts of this document, statement, or book that follow; after this

Hereinadverb

Within this content, context, or thing.

Hereinafteradverb

In the following part of this (writing, document, speech, and the like).

Hereinadverb

In this.

‘Herein is my Father glorified, that ye bear much fruit.’;

Hereinafteradverb

in a subsequent part of this document or statement or matter etc.;

‘the landlord demises unto the tenant the premises hereinafter called the demised premises’; ‘the terms specified hereunder’;

Hereinadverb

in this place or thing or document;

‘I shall discuss the question herein’;