transcendental - very important, very significant,...
  sobremanera - greatly, exceedingly
  autónomo - autonomous, self-governing,...
  el contratiempo - setback, mishap, problem with getting...
  el autostopista, la autostopista, el autoestopista, la autoestopista - hitchhiker
  subsanable - solvable, fixable, rectifiable
  el bipartidismo - two-party political system
  antideslizante - anti-skid, nonskid, anti-slip, nonslip
  el yerno, la yerna - son-in-law, daughter-in-law
  WC, W.C. - toilet (abbreviation of <i>water...
  el zafiro - sapphire
  el zutano, la zutana - so-and-so (referring to a person),...
  la zanahoria - carrot
  el zapapico - pickax, pickaxe
  el yate - yacht
  la xilografía - wood engraving, the practice of...
  el yeísmo - pronouncing the Spanish <i>ll</i> and...
  el yodo - iodine
  el zapping - the practice of changing channels or...
  la yuxtaposición - juxtaposition