Ōc'tave1, a.
a. [Lat. octavus, eighth, from octo, eight; Sp. octavo, Pg. oitavo, It. ottavo, Fr. octau.] Consisting of eight; eight. Dryden.
2 entries under this word
Octave
Ŏc'tave2, n.
n. [Fr. octave, Pr. & Sp. octava, Pg. oitava, It. ottava, from Lat. octavus. See supra.]
Sense 1. The eighth day after a church festival, the festival itself being included; hence, also, the week immediately following a church festival. “The power of remitting and retaining sins in the octaves of Easter.” Bp. Taylor.
Sense 2. (Mus.) (a.) The eighth tone in the scale; the interval between one and eight of the scale. (b.) The scale itself.