(in classical Greece) the interval of a perfect fourth
2.
a conflation of the four Gospels into a single continuous narrative
Word origin
C14: from Late Latin, from Greek dia tessarōn khordōn sumphōnia concord through four notes, from dia through + tessares four
diatessaron in American English
(ˌdaɪəˈtɛsəˌrɑn)
noun
the four Gospels combined into a single account
Word origin
L(Ec) < Gr(Ec) (Evangelion) dia tessarōn, lit., (Gospel) through four, title of Tatian's harmony of four Gospels (2d c.) dia, through + tessarōn, gen. of tessares, four < IE base *kwetwer-, four