adj

• (of a branch of science) Done for its own sake instead of serving another branch of science.
  "The [Isaac] Newton that emerges from the [unpublished] manuscripts is far from the popular image of a rational practitioner of cold and pure reason. The architect of modern science was himself not very modern. He was obsessed with alchemy."
• (phonetics) Of a single, simple sound or tone; said of some vowels and the unaspirated consonants.
• (of sound) Without harmonics or overtones; not harsh or discordant.
• (Bermuda, slang) A lot of.
  "Well when ah's youngah, ah'd just light a candle rahn de dinna table play pure crazy 8s and spades vif my brotha til we lot dozed off..."

adv

• (Liverpool, Scotland) to a great extent or degree; extremely; exceedingly.
  "You’re pure busy."

verb

• (golf) To hit (the ball) completely cleanly and accurately.
  "Tiger Woods pured his first drive straight down the middle of the fairway."
• (transitive, obsolete) To cleanse; to refine.