Where does “deterrency” come from?

deterrency (English) comes from English deter, from Latin dēterreō, from Latin terreō, from Proto-Indo-European tres-, from Proto-Indo-European ter-, from Italian termine, from Latin terminus, from Proto-Italic termenos — boundary, end.

Ancestry of “deterrency”, step by step

StepLanguageWordMeaning
1EnglishdeterTo prevent something from happening; To persuade...
2Latindēterreōto frighten off, deter, discourage, prevent, hinder
3Latinterreōto frighten, terrify, alarm
4Proto-Indo-Europeantres-to tremble
5Proto-Indo-Europeanter-tender, weak; young creature
6Italiantermineend, close; limit, term, date, time; term, word
7Latinterminusa boundary, limit, end
8Proto-Italictermenos
9Proto-Indo-Europeantérmn̥boundary, end
Every word from Proto-Indo-European térmn̥