Noun : to determine the magnitude of an angle. ,affairs of magnitude. ,magnitude of mind.    From Dictionary.com. 

I refer, of course, to Star Jones' upcoming nuptials, an event too magnitudinous for me to ignore.    From Wordnik.com.  [Archive 2004-09-01] Reference

Prominently rises the impressive magnitudinous structure of the reverenced cathedral there, its dome of the hue of heaven's blue and set with stars of solid gold.    From Wordnik.com.  [The History of the American Expedition Fighting the Bolsheviki Campaigning in North Russia 1918-1919] Reference

He was so humbly born, so lowly in station, so destitute of fortune, and withal so honest a Papist, that not the slightest tokens presented to mark him out as the chosen instrument to grapple with the magnitudinous tyranny by which Europe was enthralled.    From Wordnik.com.  [Luther and the Reformation: The Life-Springs of Our Liberties] Reference

The student bought this magnitudinous and altitudinous tile and by tying tape across it managed to balance it on his head.    From Wordnik.com.  [History of the University of North Carolina. Volume I: From its Beginning to the Death of President Swain, 1789-1868] Reference

My own appetite is already one magnitudinous toothache. ".    From Wordnik.com.  [No. 13 Washington Square] Reference