American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
And when Susan acclimates to her gigantism, running amok around San Francisco trying to dodge Gallaxhar's robot, there's an inventive chase sequence in which she fastens two cars to her feet and uses them as roller skates.— Box Office Prophets
If Henry Irving represents somewhat literal-minded Victorian gigantism (why represent a bluebell wood on stage if you can afford to instal the real thing?), Craig epitomised new-wave megalomania.— New Statesman
A syndrome of multiorgan hyperplasia with features of gigantism, tumorigenesis, and female sterility in p27 (Kip1) - deficient mice.— CiteULike: Everyone's library
Dr Kuntner explained that the widely accepted theory was that evolutionary pressure was causing female "gigantism", with the females increasing in size in order to produce larger numbers of offspring.— BBC News | News Front Page | UK Edition

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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