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1.
the couple name of Ron Weasley & Hermione Granger.
ROn + HerMIONE = Romione.

Mostly used on tumblr from hardcore shippers such as myself.
"Who is your OTP in Harry Potter?"
"Romione!"
by romioneshipper#25 July 31, 2011
 
2.
The ship name for Ron Weasley and Hermione Granger in J.K. Rowling's Harry Potter franchise.
SPOILER ALERT: This ship ends up together at the end of the series, and married in the epilogue. They have a son and daughter: Rose and Hugo Weasley.
HPer 1: I'm such a dromione fan. Will never stop reading those ships.
HPer 2: How can you not be a romione? OTP FOR LIFE.
by emilysnap May 30, 2011
 
3.
The ship name of Ron Weasley and Hermione Granger
The best thing in the universe and way better than Draco/Hermione
Teacher: name one if your OTP's
Student: Romione is da bomb!
by Maniac Coma July 23, 2014