名詞 octave:

1. a feast day and the seven days following it
2. a musical interval of eight tones
   同義詞：musical octave
3. a rhythmic group of eight lines of verse

1. Can you span an octave on the piano?
   乍能按到鋼琴的八個(gè)鍵嗎？
2. Designating the three basic intervals of the octave, fourth, and fifth.
   完全音程的指出八音度、四音度、五音度三個(gè)基本停頓的

oc.tave

n.（名詞）
Music
【音樂】
The interval of eight diatonic degrees between two tones, one of which has twice as many vibrations per second as the other.
八度音程：兩個(gè)音程之間有八個(gè)音度的間隔，其中一個(gè)每秒的振動(dòng)是另一個(gè)的兩倍
A tone that is eight full tones above or below another given tone.
八度音：一個(gè)正好比已知音高八度或低八度的音
Two tones eight diatonic degrees apart that are sounded together.
八度和音：兩個(gè)相差八度的音的和聲組合
The consonance that results when two tones eight diatonic degrees apart are sounded.
出兩個(gè)相距八度的音發(fā)音時(shí)所產(chǎn)生的和音
A series of tones included within this interval or the keys of an instrument that produce such a series.
八度音階：在此間隔中包含的一系列音或發(fā)出這些音的樂器鍵
An organ stop that produces tones an octave above those usually produced by the keys played.
八度音栓：風(fēng)琴上能發(fā)出高于這一主音正常音高八度的音栓
The interval between any two frequencies having a ratio of 2 to .
倍頻程：頻率比率為2比的兩個(gè)頻率的間隔
Ecclesiastical
【基督教會(huì)】
The eighth day after a feast day, counting the feast day as one.
第八天：教會(huì)節(jié)日后從該日算起的第八天
The entire period between a feast day and the eighth day following it.
從節(jié)日算起的八天周期
A group or series of eight.
八個(gè)一組或一個(gè)系列

A group of eight lines of poetry, especially the first eight lines of a Petrarchan sonnet.Also called octet
前八行詩：詩歌中一組八行，尤指彼得拉克十四行詩中的前八行也作 octet
A poem or stanza containing eight lines.
八行詩：含有八行的一首詩或詩節(jié)
Sports A rotating parry in fencing.
【體育運(yùn)動(dòng)】 第八姿勢：擊劍中一種輪流的閃避

來源：
Middle English [eighth day after a feast day]
中古英語 [節(jié)日后第八天]
from Old French
源自 古法語
from Medieval Latin oct3va (diôs)
源自 中世紀(jì)拉丁語 oct3va (diôs)
from Latin [feminine of] oct3vus [eighth]
源自 拉丁語 [] oct3vus的陰性詞 [第八]
from octô [eight] * see oktô(u)
源自 octô [八] *參見 oktô(u)

【引伸】
octa.val