"I ask thee, eternal time... Reveal my body, yoked in twilight... Return my true body to me!" - Alice
Word of Dispel is a special skill taught to Alice by Tamamo in Chapter 3, after defeating Principality Nagael. In later battles, this allows Alice to temporary return to her true form for just three seconds, that is, one turn and let loose either Omega Blaze, Frost Ozma, Monster Lord’s Cruelty, or Eye of Recovery.
This skill is actually Tamamo's trump card; as a member of the Six Ancestors, she used this skill to temporarily revert back to her original sealed form. Unlike Alice, Tamamo seems to be able to maintain the form for longer than a few seconds. She uses Word of Dispel thrice: when backed by Tsukuyomi, against the final fight with Ilias, and after Luka proposes marriage to her in which she happily has sex with him with her original body.