IPA: /prəˈskrɪpʃən/
KK: /prəˈskrɪpʃən/
The act of officially forbidding something or declaring it illegal.
The proscription of certain books led to a heated debate about freedom of speech.
Proscription is formed from "pro-" (meaning before or in front of) and "scriptio" (from "scribere", meaning to write). The term originally referred to the act of writing something down in advance, particularly in the context of listing individuals who were banned or outlawed.
Think of 'writing down' ('scriptio') names of those who are 'before' ('pro-') the law, which helps you remember that proscription means a formal prohibition or ban.