名詞 fifth:

1. a quantity of liquor equal to one fifth of a United States gallon
2. position five in a countable series of things
3. one part in five equal parts
   同義詞：one-fifth, fifth part, twenty percent
4. the musical interval between one note and another five notes away from it

形容詞 fifth:

1. coming next after the fourth and just before the sixth in position
   同義詞：5th

1. The team has chalked up its fifth win in a row.
   這隊一連五次取得勝利。
2. It was a real marvel that the baby was unhurt when he fell from the fifth floor.
   那嬰兒從五樓摔下來竟沒受傷真是一個奇跡。
3. He passed me one fifth of the cake.
   他遞給我五分之一個蛋糕。

fifth

n.（名詞）
The ordinal number matching the number five in a series.
第五：在系列中排在第五的序數(shù)
One of five equal parts.
五分之一
One fifth of a gallon or four fifths of a quart of liquor.
五分之一加侖或一夸脫酒的五分之四
Music
【音樂】
An interval encompassing five diatonic tones, such as C, D, E, F, and G.
五度音程：包含五個全音階音調(diào)如C、D、E、F和G的時間間隔
The harmonic combination of the two tones constituting the extremities of such an interval.
五度和音：含有這樣的五度音程的末端的兩個音調(diào)的和聲組合
The dominant in a given key or tonality.
第五音：所給調(diào)子或音調(diào)中的主音
Fifth The Fifth Amendment. Used withthe.
Fifth 第五修正案：第五次修訂的美國憲法，連用于the

來源：
Middle English
中古英語
from Old English fofta * see penk we
源自 古英語 fofta *參見 penk we

【引伸】
fifth
adv.（副詞）
adj.（形容詞）
fifth.ly
adv.（副詞）