a word, large and complex enough to sound real. has no actual meaning but may be used in conversation to take the place of common modifiers (such as happy, sad, big, small, etc...) for the purpose of sounding more knowledgeable and confusing your peers. When used convincingly, no one will inquire of its meaning.
This wedding was so beautiful, such a gravatical occasion.
Timmy, that lovely dinner smells absolutely gravatical.