enabler

noun

1. One who or that which helps something to happen.

   “The computer is an essential enabler of the conversation.”

   “The introduction of 33 bi-mode trains from 2023 will be an enabler for electrification of the Midland Main Line, claims East Midlands Railway Commercial Director Chris Wright.”

2. One who encourages a bad habit in another (typically drug addiction) by their behavior.

   “In business, due to the stigma of alcoholism, enablers have their jobs and incomes at stake if their boss's secret is uncovered.”

3. One who gives someone else the power to behave in a certain way.

   ““ [Donald J.] Trump wants to mothball billions of dollars in investment and cancel one of the best new sources of American-made, renewable energy,” Mr. [William] Tong said. “Trump and his enablers will own the resulting cost increases for ratepayers.””