fifth


Concise Oxford English Dictionary © 2008 Oxford University Press:
fifth/fɪfθ/
ordinal number
  • 1 constituting number five in a sequence; 5th.
  • 2 (a fifth/one fifth) each of five equal parts into which something is or may be divided.
  • 3 Music an interval spanning five consecutive notes in a diatonic scale, in particular (also perfect fifth) an interval of three tones and a semitone.

    ■ the note which is higher by such an interval than the root of a diatonic scale.

  • 4 US informal a fifth of a gallon, as a measure of alcoholic drink.
– phrases
take the fifth (in the US) exercise the right guaranteed by the Fifth Amendment to the Constitution of refusing to answer questions in order to avoid incriminating oneself.
– derivatives
fifthly adverb.
'fifth' also found in these Oxford entries:

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