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hiatus (n.)

1560s, "break or opening" in a material object, especially in anatomy, from Latin hiatus "opening, aperture, rupture, gap," from past participle stem of hiare "to gape, stand open," from PIE root *ghieh- "to yawn, gape, be wide open." Sense of "gap or interruption in events, etc.;" "space from which something requisite to completeness is absent" [Century Dictionary] is recorded from 1610s.

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Definitions of hiatus from WordNet

hiatus (n.)
an interruption in the intensity or amount of something;
hiatus (n.)
a missing piece (as a gap in a manuscript);
hiatus (n.)
a natural opening or perforation through a bone or a membranous structure;
Synonyms: foramen
From wordnet.princeton.edu