noun

• (obsolete) Speed, full speed; impetuosity, force.
  "they were messagers vnto kyng Ban & Bors sent from kynge Arthur / therfor said the viij knyghtes ye shalle dye or be prysoners / for we ben knyghtes of kyng Claudas And therwith two of them dressid theire sperys / and Vlfyus and Brastias dressid theire speres and ranne to gyder with grete raundon"
• (obsolete) The full range of a bullet or other projectile; hence, the angle at which a weapon is tilted to allow the greatest range.
  "Fortie yards will they shoot levell, or very neare the marke, and 120 is their best at Random."
• (figuratively, colloquial) An undefined, unknown or unimportant person; a person of no consequence.
  "The party was boring. It was full of randoms."
• (mining) The direction of a rake-vein.

adj

• (statistics) Involving an outcome which is impossible to predict, but which may be represented by a probability distribution; in the ideal case, involving outcomes which are equally likely.
  "Near-synonyms: aleatory, stochastic"
• (computing) Pseudorandom; mimicking the result of random selection.
  "The rand function generates a random number from a seed."
• (informal) Selected for no particular reason; arbitrary; unspecified.
  "A random American off the street couldn't tell the difference."
• (informal) Being (part of) a varied, unrelated, and apparently arbitrary collection of things; diverse, heterogeneous.
  "My notebook has turned into a random collection of thoughts."

verb

• (intransitive, now uncommon) To wander; to stray; to meander.