ot5 

a terminology used in the One Direction fandom for the fans who preferred the band as a 5 member boy group, rather than 4 (after Zayn Malik left in March 25, 2015 ). It is derived from the phrase "One True Pair", where OT means "One True" and the number that follows refers to the amount of members in the band.

Jes: So, you're directioner?
Luis: Yeah, I'm an OT5 stan.
Jes: Oh, but didn't Zayn already leave?
Luis: Yeah, but they never were One Direction if Zayn didn't join the XFactor, to be honest.

ot5 by Adamas December 1, 2020

ot5 

When you equally love all 5 members of a group.

stan txt lol

Me: Hey! Do you stan txt?

Them: Yes! I'm an ot5.

ot5 by hottest moa stan alive December 20, 2021

ot5 

term used in the one direction fandom to refer to this fans who stan the 5 of the boys. They support and love all of them, Niall, Liam, Harry, Louis and Zayn.

Person 1: Are you a directioner?
Person 2: Yes, i’m an ot5

ot5 by cuteasabuttonhe November 3, 2020

OT5 

Like OTP, but involving 5 people. Often refers to a big bromance instead of something romantic.

Person 1: One Direction is my ultimate OT5 tbh
Person 2: I know, one big romance--Bromance!

OT5 by Gra aa hma October 2, 2012

OT5 

A paring in Tennis no oijisama, or Prince of Tennis, in which the characters Echizen Ryoma, Tezuka Kunimitsu, Fiji Syuusuke, Atobe Keigo and Sanada Genichiro are in a 5-some.

"I am a major fan of the OT5"

OT5 by IKMcGwee May 21, 2007