All 6 Uses

medieval
in
Someone Like You
(Auto-generated)

It's like a history club, where they study the medieval period together, on weekends.†
Chpt 4 *
He has this, like, medieval alter-ego, and on the weekends he and all his friends dress up in medieval clothes and become these characters.†
Chpt 4
He has this, like, medieval alter-ego, and on the weekends he and all his friends dress up in medieval clothes and become these characters.†
Chpt 4
She was going to a medieval tournament with Vlad that night, and was already dressed for the part in a long velvet dress with puffy sleeves that made her look like Guinevere, or maybe Sleeping Beauty.†
Chpt 18
She was off jousting, or doing medieval dances, or whatever she and Vlad did on their theme weekends.†
Chpt 18
And on the other side of the waiting room, segregated by some chairs and modern time, were Vlad, a breathless Marion, and at least twenty other warriors and maidens, all decked out in full medieval regalia.†
Chpt 19

Definitions:

(1) (medieval)
relating to or belonging to the Middle Ages

(the period of European history between the fall of the Roman Empire and the beginning of the Renaissance -- roughly 500–1500 AD)

Often thought of as a time of instability, superstition, plagues, feudal lords, and knighthood.
(2) (meaning too rare to warrant focus)
Much more rarely, medieval may be used to refer to something as old-fashioned and unenlightened.