noun

• (countable, slightly dated) Clipping of discotheque (“nightclub for dancing”).
  "Burn down the disco / Hang the blessed DJ / Because the music that they constantly play / It says nothing to me about my life"
• (uncountable, music) A genre of dance music that was popular in the 1970s, characterized by elements of soul music with a strong Latin-American beat and often accompanied by pulsating lights.
  "And black music became a hot commodity in the form of disco, its lyrics and rhythm laced with a palpable (even ethnic) amiguity, helping people dance and escape their concerns. Even the cry of “burn, baby, burn”, a popular chant during many a 1960s urban rebellion, was co-opted by the times, becoming the chorus for the 1977 dance hit “Disco Inferno.”"
• (British) A dance, a social gathering where dancing is the main activity.

verb

• (intransitive) To dance disco-style dances.
  "The cause of his ill health is left a little obscure, and no wonder, because shortly before his dreadful deathbed scene he's well enough to join the women in a wild night of disco dancing. You have not lived until you've seen Martin Landau discoing."
• (intransitive) To go to discotheques.
  "Learning that a discoing sex appeal has returned to the runways is a little like hearing that Barbra Streisand and Barry Gibb are reuniting."

noun

• (US, law, informal) discovery (pre-trial phase in which evidence is gathered)
  "You don't need to worry about these details at the complaint stage, we can get them in disco."
• (US, law, informal) discovery (materials revealed to the opposing party during the pre-trial phase in which evidence is gathered)
  "Has the disco come in from the defendants yet? We sent them requests almost six weeks ago."