gig•glePronunciation: (gig'ul), [key]
—v., -gled, -gling,
to laugh in a silly, often high-pitched way, esp. with short, repeated gasps and titters, as from juvenile or ill-concealed amusement or nervous embarrassment.
a silly, spasmodic laugh; titter.
an amusing experience, incident, etc.: Going to a silly movie was always a giggle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.