The OED, Oxford English Dictionary, is considered one of the main comprehensive dictionaries of the entire English language. The OED was initially started in the 19th century and maintains updates to this day. The OED (in physical form) is usually a VERY LARGE multi-volume (up to 10 or 15 books as I recall) dictionary. It is EXHAUSTIVE.
"The Oxford English Dictionary (OED) is widely accepted as the most complete record of the English language ever assembled."
https://library.harvard.edu/services-tools/oxford-english-dictionary
It defines "Universal" thusly:
universal, adj., n., & adv.
Extending over or including
the whole of something specified or implied, esp.
the whole of a particular group or the whole world;