Definitions
1.nounA gap in a series, making it incomplete.
2.nounAn interruption, break or pause.
3.nounAn unexpected break from work.
4.nounA gap in geological strata.
5.nounAn opening in an organ."Hiatus aorticus is an opening in the diaphragm through which aorta and thoracic duct pass."
6.nounA syllable break between two vowels, without an intervening consonant. (Compare diphthong.)"Words like reality and naïve contain vowels in hiatus."