| Sexennial 1. (a.) Lasting six years, or happening once in six years. 2. (n.) A sexennial event. Thesaurus Entries consecutive intervals, decimalization, decimation, degree, diapason, diatessaron, diatonic interval, diatonic semitone, enharmonic diesis, enharmonic interval, fifth, fourth, half step, halftone, hexad, hexadic, hexagonal, hexahedral, hexamerous, hexangular, hexapartite, hexastyle, hexatomic, hexavalent, interval, less semitone, melodic interval, note, octave, parallel octaves, quinquepartition, quinquesection, second, semitone, senary, seventh, sexennial, sextipartite, sextipartition, sextuple, sixfold, step, tenth, third, tithe, tone, unison interval, whole step |