1a obsolete : being an omen : PORTENTOUS
b : resembling or befitting a prodigy : STRANGE, UNUSUAL
2 : causing amazement or wonder
3 : extraordinary in bulk, quantity, or degree : ENORMOUS
I encountered the word in a sentence found in the article ” A Literary Visitor Strolls in From the Airport”, written by Charles McGrath”. The sentence the word was written in says, “Smoking is Mr. self’s only remaining vice. He used to be a prodigious drinker and drug-taker, famous for late – night altercations, not always coherent public appearance and marathon hours at trendy spots like Groucho Club.”The word was written to describe Mr.Self’s immense ability to drink.