twelfth

number

• 1constituting number twelve in a sequence; 12th:the twelfth of November his twelfth birthday the twelfth in a series of essays
• Music an interval or chord spanning an octave and a fifth in the diatonic scale, or a note separated from another by this interval.
• (the Twelfth or the Glorious Twelfth) (in the UK) 12 August, the day on which the grouse-shooting season begins.
• (the Twelfth) 12 July, celebrated by upholders of Protestant supremacy in Ireland as the anniversary of William III’s victory over James II at the Battle of the Boyne.

• 2 (a twelfth/one twelfth) each of twelve equal parts into which something is or may be divided.