IPA: /nɒnˌɪmpɔːrˈteɪʃən/
KK: /nɑnˌɪmpɔrˈteɪʃən/
A policy that involves not bringing in goods from other countries, particularly used in the context of 18th century America to stop imports from Britain.
The colonies adopted a nonimportation agreement to protest British taxes.
Nonimportation → It is formed from "non-" (meaning not) and "importation" (from Latin "importare", meaning to bring in). The word refers to the act of not bringing goods into a country.
Think of 'not' ('non-') bringing in goods ('importation') — that's what nonimportation means.