integral - complete, comprehensive, total, made...
  el invierno - winter, rainy season (in the tropics)
  el interlineado - space between lines of text, leading
  interino - temporary, interim, stopgap, stand-in
  el IVA (impuesto sobre el valor añadido) - VAT (value-added tax)
  el islote - small island, usually rocky and...
  iracundo - angry, irate, irascible
  intratable - difficult to get along with,...
  la intriga - intrigue, suspense, curiosity, a...
  igualado - level, at the same level, leveled...
  el ideario - ideology, philosophy or approach to...
  ileso - unhurt, unharmed
  irrebatible - indisputable, irrefutable
  inviable - impractical, not feasible, unviable
  el informe - report, news report, work reference,...
  la injuria - insult, slander, psychological abuse,...
  el intercambio - exchange, trade, swap
  intranquilo - disquieted, worried, nervous, uneasy,...
  intrascendente - insignificant, unimportant
  intrínseco - intrinsic, inherent