American Heritage Dictionary
(2)
Century Dictionary
(6)
GNU Webster's 1913
(3)
WordNet
(2)
Elsewhere on the web
There are plenty of lines at which one is clearly expected to titter, but nothing resembling wit, and much that is distasteful -— The Independent - Frontpage RSS Feed
But the actresses seem unable to resist milking each titter or gasp.— The Guardian World News
Evoking a weak titter or two, cut off by a voice from the audience.— Pulpnoir.com

American Heritage Dictionary (1)
Century Dictionary (4)
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 several times a year.
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