Prohibitive means so high in cost that it stops people. Prohibitive prices, prohibitively expensive, a prohibitive fee.
It says the price acts as a ban without anybody banning anything, which is a useful thing to be able to say. The other sense is literal: a prohibitive rule is one that forbids.
1adjectiveprohibitiveSo high in cost that it stops people.
“The cost of housing in the city centre is prohibitive for most young people.”
prohibitive is a quality.
Latin prohibitivus comes from prohibere, to hold back, from pro plus habere, to hold.
Latin
prohibeō
Medieval Latin
prohibitīvus
Middle English
prohibitif
English, today
prohibitive
From Middle English prohibitif, prohibityve, from Medieval Latin prohibitīvus, from prohibit-, past-participle stem of Latin prohibeō. by surface analysis, prohibit + -ive.
Etymology from Wiktionary, CC BY-SA