based

Etymology 1

base + -ed

adj

1. Founded on; having a basis; often used in combining forms.
   That was a soundly based argument.

verb

1. simple past and past participle of base
   1. Being derived from (usually followed by on or upon).
      It's a new film based on a best-selling novel.
   2. Having a base">base
      The ladder is based on the even sidewalk for stability.
   3. Having a base of operations.
      The company is based in New York.

Etymology 2

A reference to freebase cocaine, via basehead. Coined by American musician Lil B to describe his lifestyle.

adj

1. (slang, of a person) Not caring what others think about one's personality, style, or behavior; focused on maintaining individuality.
   Based means being yourself. Not being scared of what people think about you. Not being afraid to do what you wanna do. Being positive. […] Based is positive. June 10 2010, Lil B, Complex.com
   You have to work as a human with empathy and love in your heart, staying positive and staying based and staying normal. 12 April 2012, Duncan Cooper, “Based Scripture: The Full Transcript of Lil B’s Lecture at NYU”, in The Fader
2. (Internet slang) Admirable; praiseworthy.
   OP is based as hell
   1. (Internet slang, originally 4chan) Admirable for rejecting liberalism or left-wing values.
      based and redpilled
      My last account got banned for being too based.
      Those who are against Trump are not based at all. On February 16th, The Donald users comment on a “based” post in r/DankMemes which uses a classic Squidward sleeping meme to criticize those who are upset by Chris Pratt going to “church” (one which was purportedly anti-LGBT) but “ok” with sex predators in Hollywood: […] 2019, Kira Stalker, "The Fracturing of the Alt Right: Conflicting Online Discourses Of White Nationalist Communities", thesis submitted to George Mason University, page 139
      His [Brenton Tarrant's] meme-themed shooting greatly represents the spirit of the aussie people, in the sense of shitposting until their last moment, based and redpilled he is. 2019, anonymous, quoted in Cathrine Thorleifsson, "From cyberfascism to terrorism: On 4chan/pol/ culture and the transnational production of memetic violence", Nations and Nationalism, Volume 28, Issue 1, page 293
      Then, in the same month, noted feminist Christina Hoff Sommers was branded “white supremacy-adjacent” by feminist Roxane Gay. Her reasoning? That our beloved “Based Mom” once appeared at an event with Milo Yiannopoulos and didn't disavow him enough. 2020, David Rubin, Don't Burn This Book: Thinking for Yourself in an Age of Unreason, unnumbered page

intj

1. (Internet slang, 4chan) Indicating emphatic approval of a statement or opinion.
   —There is no ethical consumption under capitalism. —Based.