1. (n.) A gap or interruption in space or time; as a hiatus in a manuscript; a hiatus from one's work\; An opening; an aperture; a gap; a chasm; esp., a defect in a manuscript, where some part is lost or effaced; a break.

2. (n.) The concurrence of two vowels in two successive words or syllables.

aperture arrearage breach break broaching caesura cavity cessation chasm check clearance clearing cleft crack defalcation defect deficiency deficit disclosure discontinuity distance between double space em space en space fenestra fissure fistula fontanel foramen freeboard gap gape gat gulf hair space half space hole hollow inlet interim intermediate space intermission interruption interspace interstice interval jump lack lacuna laying open leak leap leeway letup lull margin missing link need omission opening opening up orifice outage outlet passageway pause pore room shortage single space slot space space between split stoma suspension throwing open time interval ullage uncorking unstopping want wantage yawn