lacuna

n. missing piece, empty space, gap; cavity, depression, small opening (Anatomy); lexical gap, lack of a word in a specific language (Linguistics)

Generally, a lacuna is a gap. The term may refer to:Lacuna (manuscripts), a missing section of textLacuna (music), an extended silence in a piece of musicLacuna (linguistics), a lexical gap in a languageLacuna (law) is the lack of law or of a legal source addressing a situationLacuna (histology), a small space containing an osteocyte in bone or chondrocyte in cartilageLacuna model, a tool for unlocking culture differences or missing "gaps" in textLacunar amnesia, in psychology, amnesia about a specific eventLacuna (geology), a large gap in the stratigraphic record, sometimes called a hiatus or unconformity
See more at Wikipedia.org...

Noun
1. a blank gap or missing part
(synonym) blank
(hypernym) gap, crack
2. an ornamental sunken panel in a ceiling or dome
(synonym) coffer, caisson
(hypernym) panel

n. gap, vacancy, lacuna, hiatus, blank

n. lacuna, blank; gap, hiatus; chasm, vacuity