Without any context, Apple’s Dictionary lookup serves up the definition of “cromulent” from both OED and New OED entries. It was apparently added in 2017 according to a Reddit thread, and in 2018 according to this list: https://public.oed.com/updates/new-words-list-june-2018/

Merriam-Webster added “embiggen” but declined to add “cromulent”: https://www.bbc.com/news/newsbeat-43298229