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From The Collaborative International Dictionary of English v.0.48:
Hiatus \Hi*a"tus\, n.; pl. L. Hiatus, E. Hiatuses. [L., fr. hiare, hiatum, to gape; akin to E. yawn. See Yawn.] 1. An opening; an aperture; a gap; a chasm; esp., a defect in a manuscript, where some part is lost or effaced; a space where something is wanting; a break. [1913 Webster] 2. (Gram.) The concurrence of two vowels in two successive words or syllables. --Pope. [1913 Webster]