intersticio, m., interstice, crack.
intervalo, m., interval.
intimamente, intimately.
intimidar, to intimidate.
intranquilo, -a, restless, moving, shifting.
intrincado, -a, intricate, obscure.
introducción, f, introduction.
introito, m., (eccl.) introit, a psalm or anthem sung immediately before the communion or mass.
intruso, m, intruder.