The Collaborative International Dictionary
Diastem
Diastem \Di"a*stem\, n. [L. diastema, Gr. ?, fr. ?: cf. F. diast[`e]me.]
Intervening space; interval.
(Anc. Mus.) An interval. [1913 Webster] ||
Wiktionary
diastem
n. 1 Intervening space; interval. 2 (context obsolete music English) An interval. 3 (context geology English) A minor depositional break.