1der

noun1

1. •
   (Internet) Abbreviation of wonder.

   • Don't you hate that, just 1ce I'd like to see people use one instead of 1. It's a 1der that any1 is able to get a high school diploma — 1998

verb1

1. •
   (Internet) Abbreviation of wonder.

   • I 1der Y the show was so short.... I almost went 2 that show, but I didn't have a ride down 2 Detroit. — 2000

noun3

1. •
   A fan of the English-Irish pop boy band One Direction.

   • Please note that I left out their actual usernames so as to protect their identities. Please also note that more than one had a One Direction reference in their names. Them 1Ders are intense! — 2015
2. •
   Abbreviation of One Directioner.
3. •
   A member of the English-Irish pop boy band One Direction.

   • Louis Tomlinson became the first 1Der dad when he and Briana Jungwirth welcomed son Freddie Reign. — 2017