American Heritage Dictionary
(2)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Zisser speaks for a growing consensus that there is "a lacuna, a need."— Writings from the Middle East Forum and Middle East Quarterly.
Perhaps these pulled punches explain the novel's weirdest lacuna: the trial of God.— National Review Online
Mehr Licht, Said Goethe -- The biggest remaining lacuna is the lack of illumination.— TidBITS: Mac News for the Rest of Us

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