IPA: /ðeəˈraɪnˌæftə/
KK: /ðɛrˈɪnˌæftər/
In a later part of a document or speech.
The terms of the agreement are outlined in section 5, and the responsibilities are detailed thereinafter.
Thereinafter → It is formed from "there" (meaning in that place) and "inafter" (from Old English "in" meaning in and "æfter" meaning after). The word "thereinafter" means in that place after a certain point in time or text.
Think of 'there' meaning a specific place and 'inafter' meaning after that point — together, they help you remember that 'thereinafter' refers to something that occurs after a specified point.