The state of being equivalent in value, force, purpose, etc.
Season 2, Episode 4 - The Griffin Equivalency
Aired October 13, 2008
When Raj is featured in People's "30 under 30 to watch", the news goes to his head and makes him obnoxious to be around. After his friends desert him, Penny is left to accompany Raj to the reception, which the newly confident Raj misconstrues as a date.
Season 6, Episode 12 - The Egg Salad Equivalency
Aired January 3, 2013
After Sheldon's assistant makes a move on Leonard, his plan to focus her mind back on work lands him with a sexual harassment complaint. When Sheldon has a meeting with the human resources department, he gets his friends in trouble, too. Meanwhile, Penny feels insecure about her relationship when she learns Alex was hitting on Leonard.
Season 8, Episode 8 - The Prom Equivalency
Aired November 6, 2014
After seeing Penny's old prom dress, the girls realize none of them had a memorable prom experience. They decide to throw a new prom with the guys in their life on the roof of the apartment building. As Sheldon learns about prom customs, he worries that Amy will be expecting something to happen between them. Meanwhile, Howard is angered by Stuart's choice of guest for the prom.